Carrier infinity fault code 41

Carrier infinity is one of the most dependable air conditioning units you can have.

But like any other air con, a problem may occasionally arise that prevents the AC from cooling efficiently, leaving you exposed to scorching heat when summer comes around.

Luckily, the displayed fault codes can give you a clue about the exact malfunctioning part to help you resolve the issue.

And the good thing is that a great deal of the problems have uncomplicated solutions.

Use this carrier infinity fault codes troubleshooting guide to fix your unit and beat the blistering heat the peak of summers bring.

It’s worth mentioning that we will also look at some of the most common Carrier thermostat error codes and even the commonest carrier infinity furnace fault codes.

Carrier infinity fault codes – guide to troubleshooting various carrier infinity error codes

Use this detailed carrier infinity troubleshooting guide to service your product….

Carrier infinity fault codes -Outdoor Unit Generated error codes (assorted models)

Flash Code on Outdoor Board: 51 for 38TDB, YDB 598B, 698B  models and 32 for 24ANA, 25HNA 187A, 180A, 286A, 288A

Fault description: Low Pressure Switch trip

Potential cause and action: Switch is monitored at all

Flash Code on Outdoor Board: 52 for 38TDB, YDB 598B, 698B  models and 31 for 24ANA, 25HNA 187A, 180A, 286A, 288A

Fault description: High Pressure Switch trip

Potential cause and action: High-pressure switch trip. Re-Check refrigerant charge and the coils for air flow restrictions.

Flash Code on Outdoor Board: 3 for 38TDB, YDB 598B, 698B  models and 53 for 24ANA, 25HNA 187A, 180A, 286A, 288A

Fault description: Outside Temp Sensor issue

Potential cause and action: Ohm out sensor and check wiring. May also indicate lost communication with  the outdoor unit.

Flash Code on Outdoor Board: 4 for 38TDB, YDB 598B, 698B  models and 55 for 24ANA, 25HNA 187A, 180A, 286A, 288A

Fault description: Coil Temp Sensor issue

Potential cause and action: Ohm out sensor fault and check wiring.

Flash Code on Outdoor Board: 34 for 38TDB, YDB 598B, 698B  models and 56 for 24ANA, 25HNA 187A, 180A, 286A, 288A

Fault description: Thermistor Range Error

Potential cause and action: Improper relationship between coil sensor and outdoor sensor. Ensure the outdoor sensor is placed outside cabinet. Ohm out sensors and check wiring.

Flash Code on Outdoor Board: 6 for 38TDB, YDB 598B, 698B  models and 73 for 24ANA, 25HNA 187A, 180A, 286A, 288A

Fault description: Contactor shorted

Potential cause and action: Voltage sensed at run capacitor when no call for compressor operation. Might be caused by stuck contactor, if contactor has been manually pushed in (by technician)

Flash Code on Outdoor Board: 71 for 24ANA, 25HNA 187A, 180A, 286A, 288A and 6 for 38TDB, YDB 598B, 698B models

Fault description: Low Capacity Thermal Cutout

Potential cause and action: Voltage present on run capacitor in low speed then disappears. Likely reasons are internal compressor over-load trip or the start relay failing to release. Check these.

Flash Code on Outdoor Board: 72 for 24ANA, 25HNA 187A, 180A, 286A, 288A and 6 for 38TDB, YDB 598B, 698B models

Fault description: High Capacity Thermal Cutout

Potential cause and action: Voltage present on run capacitor in hi speed then disappears. Likely reasons are internal compressor over-load trip or the start relay failing to release. Check them.

Flash Code on Outdoor Board:47 for 24ANA, 25HNA 187A, 180A, 286A, 288A and 6 for 38TDB, YDB 598B, 698B models

Fault description: No high voltage to outdoor unit.

Potential cause and action: Voltage not present on run capacitor when compressor should be starting. Potential triggers: disconnect removed or perhaps high-voltage not connected. Check.

Flash Code on Outdoor Board: 81 for 24ANA, 25HNA 187A, 180A, 286A, 288A and 6 for 38TDB, YDB 598B, 698B models

Fault description: Low Capacity thermal Lockout

Potential cause and action: Control detects thermal cutout in 3 consecutive low stage. On cycles

Flash Code on Outdoor Board: 82 for 24ANA, 25HNA 187A, 180A, 286A, 288A and 6 for 38TDB, YDB 598B, 698B models

Fault description: Hi Capacity thermal Lockout

Potential cause and action: Thermal cutout occurs in three consecutive high cycles in new platform outdoor units. a combination of three(3) hi & low cycles will bring this event on older platform 2 stage models.

Carrier infinity fault codes – Fan Coil Generated error codes (commonest)

Carrier thermostat error codes

Error code 16

Fault description: System Commu-nications Failure

Potential cause and action: Communication with the user interface lost. Inspect wiring to User Interface and the indoor & outdoor units

Error code 25

Fault description: Invalid Model Plug

Potential cause and action: Control is not detecting a model plug/ detects an invalid one. Unit won’t operate without the correct model plug.

Error code 31

Fault description: HighPressure Switch Open

Potential cause and action: HighPressure switch trip. Try to Re-Check refrigerant charge, out-door fan operation, and finally coils for possible airflow restrictions.

Error code 32

Fault description: LowPressure Switch Open

Potential cause and action: LowPressure switch trip. Try to Re-Check refrigerant charge and indoor airflow

Error code 45

Fault description: Control Fault

Potential cause and action: Outdoor unit control board failure. Replacement needed

Error code 46

Fault description: Brown Out (230v)

Potential cause and action: Line voltage < 187volts for at least four seconds. Fan and compressor operation not permitted until voltage>190volts. Verify actual line voltage.

Error code 47

Fault description: No 230v at Unit 

Potential cause and action: There is no 230volts at the contactor when the indoor unit is powered and cooling/ heating demand exists. Confirm the disconnect has been closed and the 230v wiring connected to the appliance.

Error code 53

Fault description: Outdoor Air Temp Sensor Fault

Potential cause and action: Outdoor air sensor out of range or not reading. Ohm out sensor and check wiring.

Error code 55

Fault description: Out-door Coil Sensor Fault

Potential cause and action: Coil sensor may not be reading or is out of range. Ohm out sensor and check wiring.

Error code 56

Fault description: Thermistors out-of-range

Potential cause and action: Improper relationship between the coil sensor & outdoor air sensor. Ohm out sensors and inspect wiring.

Error code 71

Fault description: low-stage thermal cut-out

Potential cause and action: Compressor action detected then disappeared while low-stage demand endures. Why? Internal compressor may be experiencing over-load trip or the start relay plus capacitor held in the circuit a bit long(where installed)

Error code 72

Fault description: High stage Thermal Cut-out

Potential cause and action: Compressor operation recognized then disappeared while highstage demand exists. Reasons? Internal compressor over-load trip/start relay plus capacitor held in the circuit too long(where installed)

Error code 73

Fault description: Contactor Shorted 

Potential cause and action: Compressor voltage d_etected when demand for compressor action does not exist. Contactor could be stuck closed/there is, probably, some wiring error.

Error code 7

Fault description:

Potential cause and action:

Error code 74

Fault description: No 230V at Compressor (24ANA1 Only)

Potential cause and action: Compressor voltage not sensed when compressor should be starting. Contactor could be stuck closed/there is some wiring error.

Error code 75

Fault description: Low-stage Did Not Start (24ANA7 Only)

Potential cause and action: Specified start voltage at VR terminal was not achieved in low-stage. Start relay de-energized after one second.

Error code 76

Fault description: Low-stage didn’t start three (3) times (24ANA7 Only)

Potential cause and action: For 3 (three) low-stage consecutive starts, the stipulated start voltage (at VR terminal) wasn’t achieved&start relay was de-energized. Low-stage locked out for 30 minutes.

Error code 77

Fault description: High-stage failed to start(24ANA7 models only)

Potential cause and action: Specified start voltage (at VS terminal) not attained in high-stage. The start relay de-energized after one (1) second.

Error code 78

Fault description: High-stage failed to start 3 times (24ANA7 models only)

Potential cause and action: For three(3) consecutive high-stage starts, defined start voltage (at VS terminal) was not reached & start relay de-energized. High-stage locked out (for 30 minutes).

Error code 81

Fault description: Low-stage Thermal Lockout

Potential cause and action: Thermal cut-out happens in three(3) consecutive low/high-stage cycles. Low-stage locked out (for 4 hours) or until the 24volts power recycled.

Error code 82

Fault description: High-stage Thermal Lockout

Potential cause and action: Thermal cutout occurs in three consecutive high/low-stage cycles. High-stage locked out (for 4 hours) or until the 24v power recycled

Error code 83

Fault description: Low Pressure Lockout

Potential cause and action: Low pressure switch trip has occurred during 3 consecutive cycles. Unit operation locked out (for 4 hours) or until the 24v power recycled.

Error code 84

Fault description: High Pressure Lock-out

Potential cause and action: HighPressure switch trip has happened during 3(three) consecutive cycles. The unit operation lock_ed out (for 4 hours) or until the 24v power recycled.

Error code 85

Fault description: Low contactor open (24ANA7 model Only)

Potential cause and action: Compressor voltage not sensed when compressor should be starting. Low-stage Contactor could be stuck open/there is some wiring error.

Error code 87

Fault description: High Contactor Open (24ANA7 Only)

Potential cause and action: Compressor voltage not sensed when compressor should be starting. high-stage contactor could be stuck open/there is some wiring error.

Carrier infinity fault codes –Infinity 19VS 24VNA9 fault codes

Error code 16

Description: Communications Loss

Error code 25

Description: Invalid model

Error code 31

Description: HighPressure Switch Open

Reset time (minimum in minutes): 15

Error code 32

Description: Low Pressure Trip

Reset time (minimum in minutes): 15

Error code 45

Description: Control Fault

Error code 46

Description: Brownout Event

Reset time (minimum in minutes): 6

Error code 48

Description: Lost Inverter Communications

Reset time (minimum in minutes): 6

Error code 49

Description: 230VAC Dropout-Reset Event

Reset time (minimum in minutes): 6

Error code 52

Description: Discharge Temp Sensor issue

Error code 53

Description: Out_door Air Temp Sensor problem

Error code 54

Description: Suction Temp Sensor error

Error code 55

Description: Coil Temp Sensor problem

Error code 56

Description: OAT-OCT Thermistor is Out-of-Range

Error code 57

Description: Suction Pressure Sensor error

Reset time (minimum in minutes): 15

Error code 58

Description: Suction Thermistor Range issue

Error code 59

Description: Discharge Temperature Out-of-Range

Reset time (minimum in minutes): 15

Error code 61

Description: Fan Inverter Fault

Reset time (minimum in minutes): 6

Error code 62

Description: Fan Inverter Temp. High

Reset time (minimum in minutes): 6

Error code 63

Description: Fan Inverter Over Current -SPD Limiting

Reset time (minimum in minutes): 6

Error code 65

Description: DC Voltage Low-SPD Limiting

Reset time (minimum in minutes): 6

Error code 66

Description: Outdoor Fan has Dropped Out

Reset time (minimum in minutes): 6

Error code 67

Description: Stator Heater Fault

Reset time (minimum in minutes): 6

Error code 68

Description: 10 Minutes Stage 2 Warm-up Delay

Reset time (minimum in minutes): 10

Error code 69

Description: Internal Fault in Inverter/Compressor

Reset time (minimum in minutes): 15

Error code 71

Description: Compressor Dropped Out

Reset time (minimum in minutes): 6

Error code 72

Description: Suction Over Temperature. Event

Reset time (minimum in minutes): 15

Error code 74

Description: Discharge Temp Out-of-Range Lockout

Reset time (minimum in minutes): 2 hrs.

Error code 75

Description: Maximum Power Mode-Temp

Error code 76

Description: Fan Inverter Lockout

Reset time (minimum in minutes): 2 hrs.

Error code 77

Description: Max. Power Mode-Comp Current

Error code 79

Description: Compressor/Inverter Fault

Reset time (minimum in minutes): 15

Error code 82

Description: Suction Over Temp. Lock-out ckout

Reset time (minimum in minutes): 4 hrs.

Error code 83

Description: Low Pressure Lock-out (for 4 hours)

Reset time (minimum in minutes): 4 hrs.

Error code 84

Description: High Pressure Lock-out (for 4 hours)

Reset time (minimum in minutes): 4 hrs.

Error code 85

Description: Fan Inverter Temp. Lock-out

Reset time (minimum in minutes): 15

Error code 86

Description: Fan Inverter Current Lock-out

Reset time (minimum in minutes): 15

Error code 88

Description: Inverter Temp Lock-out

Reset time (minimum in minutes): 2 hrs.

Error code 89

Description: Compressor Inverter Overcurrent Lock-out

Reset time (minimum in minutes): 15

Error code 91

Description: Inverter VDC Out Over Voltage Event

Reset time (minimum in minutes): 15

Error code 92

Description: Inverter VDC Out Under Voltage Event

Reset time (minimum in minutes): 15

Error code 93

Description: 230VAC UnderVoltage Event

Reset time (minimum in minutes): 15

Error code 94

Description: 230VAC OverVoltage Event

Reset time (minimum in minutes): 15

Error code 95

Description: High Current Lockout

Reset time (minimum in minutes): 2 hrs.

Error code 96

Description: VDC UnderVoltage Lockout

Reset time (minimum in minutes): 2 hrs.

Error code 97

Description: VDC OverVoltage Lockout

Reset time (minimum in minutes): 2 hrs.

Error code 98

Description: High Torque Event

Reset time (minimum in minutes): 10

Error code 99

Description: High Torque Lockout

Reset time (minimum in minutes): 2 hrs.

Note: Short flashes are indicated by the first digit while long flashes are indicated by the second digit in the fault/status code

Carrier infinity furnace fault codes

Error code 12

Fault description: Blower On After Power Up

Potential cause and action: Occurs when call for heat satisfies during blower on delay.

Error code 13/14/15

Fault description: Limit Circuit Lockout

Potential cause and action: Auto reset in 3 hours

Error code 21

Fault description: Gas Heating Lockout

Potential cause and action: Attention needed as control will not auto reset.

Error code 22

Fault description: Abnormal Flame-Proving Signal

Error code 23

Fault description: Pressure Switch Did Not Open

Error code 24

Fault description: Secondary Voltage Fuse Open

Potential cause and action: May see this fault during quick power interruptions

Error code 25

Fault description: Model Selection Or Setup Error

Error code 31

Fault description: High-Heat Pressure Switch Or Relay Did Not Close Or Reopened

Error code 32

Fault description: Low-Heat Pressure Switch Did Not Close Or Reopened

Potential cause and action: This fault may show up in the fault history of condensing furnaces due to unprimed trap at start up, wind, or other factors temporarily affecting the vent system. It is not necessarily a system problem. In case troubleshooting doesn’t discover a fault, turn low heat rise on in furnace setup to enhance inducer air flow by 15%.

Error code 33

Fault description: Limit Circuit Fault

Error code 34

Fault description: Ignition Proving Failure

Carrier infinity fault code 41 -furnace

Fault description: Blower Motor Fault

Potential cause and action: 41 codes may show up in fault history, but if system is operating properly, this can be ignored

Error code 42

Fault description: Inducer Motor Fault (VS Inducers Only)

Error code 43

Fault description: Low-Heat Pressure Switch Open While High-Heat Pressure Switch Closed

Error code 45

Fault description: Control Circuitry Lockout

Carrier infinity fault codes -Final word

This carrier infinity fault codes troubleshooting list is only meant to be a guide and you should not use it blindly- apply your knowledge, experience, and common sense alongside the above guidelines.

This- and obeying your instincts as you perform the diagnostics– will go a long way in helping you find the trouble spot as soon as possible.

ALSO READ:

How to reset air conditioner thermostat – steps and useful tips .

41.

Make sure perforated disks are in combustion-air vent inlet.

42.

Check pressure tubing going to gas valve air pressure fitting for kinks.

43.

Remove gas valve air pressure fitting and check gas valve for blockage.

44.

Ensure vent and combustion-air pipes are not reversed.

45.

Check burner orifice size and alignment.

46.

Add restriction to combustion-air pipe or lengthen it a few feet if possible.

47.

Jumper R and W2 thermostat terminals on furnace control board.

48.

Do you have combustion oscillations in high fire?

Fault Code 41

BLOWER OUTSIDE VALID SPEED RANGE—This fault indicates 1 of the following:

• Blower motor speed cannot be maintained within 10% of calculated speed over a 30-sec period.

• Blower motor speed is less than 250 RPM or greater than 1300 RPM for more than 10 sec.

STEP

Turn power off, remove blower access panel, and disconnect R thermostat lead from furnace con-

1.

trol board.

2.

Turn power on and depress door switch. Use a piece of tape to hold switch closed.

3.

Jumper R and W/W1 thermostat terminals on furnace control board.

4.

Observe operation of furnace for next 8 minutes or until fault occurs.

5.

Does Fault Code 44 flash twice followed by Fault Code 41?

After about 10 minutes of operation, furnace will lock out and flash Fault Code 12. Go to page num-

6.

ber indicated in Index for Fault Code 12.

7.

Does only Fault Code 41 flash?

8.

Does a different fault occur?

9.

Go to page number indicated in Index for fault code flashed.

10.

Go to page number indicated in Index for CLEANUP AND STARTUP INSTRUCTIONS.

11.

Does blower motor suddenly stop 10 sec before fault is signaled?

12.

Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals.

13.

Put setup switch SW-4 labeled EMER. HEAT in ON position.

Turn power on and wait several sec, then jumper R and W/W1 thermostat terminals on furnace con-

14.

trol board.

15.

Check connectors PL3, PL10, PL11, PL12, PL13, B1, and B2.

16.

Does motor operate intermittently in response to connectors and wires being moved?

17.

Fix problem.

18.

Does blower motor suddenly stop?

Replace entire blower motor or blower control module attached to the blower motor. If you replace

19.

the blower control module go to step 26. If problem still persists on an intermittent basis after re-

placing blower motor or blower control module, contact your distributor.

20.

Replace furnace control board.

21.

Turn power off and disconnect jumper wire across R and W/W1 thermostat terminals.

Check connectors PL3, PL10, and PL13 for possible intermittent connection of ORANGE and VIO-

22.

LET wires.

ACTION

27

—

—

42

—

—

43

—

—

44

—

—

45

—

—

46

—

—

12

—

—

48

41

12

—

YES

NO

GO TO

—

—

2

—

—

3

—

—

4

—

—

5

6

7

—

—

—

INDEX

11

8

—

9

25

—

—

—

INDEX

—

—

INDEX

12

21

—

—

—

13

—

—

14

—

—

15

—

—

16

17

18

—

—

—

10

19

20

—

—

—

INDEX

—

—

10

—

—

22

—

—

23

Carrier Infinity Thermostats are good quality and reliable units that effectively manage humidity levels, airflow, ventilation and indoor air quality among other things. But these systems can also experience issues from time to time. Other users may have challenges with their setup and operation. To help users set up, operate and resolve problems they may have with their Carrier Infinity thermostats, here is a clear troubleshooting and how-to guide addressing some of the commonly-reported issues with these controls.

How to Set Up and Operate a Carrier Infinity Thermostat

To set day, timer and desired humidity:

1. Flip down the door at the base of the Infinity Control.
2. Press the BASIC button.
3. Adjust the highlighted HOUR setting using the TIME (+/-) button.
4. Press SCROLL to highlight MINUTE. Adjust the MINUTE setting using the TIME (+/-) button.
5. Press SCROLL to highlight DAY. Adjust the current DAY setting using the TIME (+/-) button, until the correct day is displayed.
6. Press SCROLL to highlight HUMIDITY.
7. Press the red HEAT button to set the heating humidity. Adjust the desired heating humidity using either (+/-) button.
8. Press the blue COOL button to set the cooling humidity. Adjust the desired cooling humidity using either (+/-) button.
9. Press BASIC or close the door to exit.

To adjust Heating temperature:

1. Press the red HEAT button. Heating is confirmed when the red LED adjacent to the red HEAT button is lit.
2. Press the ZONE button until the name of the zone you wish to control appears on the upper left screen. Selecting “ALL ZONES” allows you to select one temperature for the entire home. Press the ZONE button for three seconds to activate the “ALL ZONES” feature.
3. Use the TEMP (+/-) button to select your desired temperature, which will be displayed on the lower right. An override time will be displayed on the lower left. Note that an override time will not appear if programming has been turned off.
4. You can change the override time in 15-minute increments by pressing the TIME (+/-) button until the desired override time is selected. Or, press the HOLD button to override the schedule indefinitely.

Check this too: Common Honeywell Thermostat Problems and How to Fix Them

To adjust cooling temperature:

1. Press the blue COOL button. Cooling is confirmed when the blue LED adjacent to the blue CL button is lit.
2. Press the ZONE button until the name of the zone you wish to control appears on the upper left screen. Selecting “ALL ZONES” allows you to select one temperature for the entire home. Press the ZONE button for three seconds to activate the “ALL ZONES” feature.
3. Use the TEMP (+/-) button to select your desired temperature, which will be displayed on the lower right. An override time will be displayed on the lower left. Note that an override time will not appear if programming has been turned off.
4. You can change the override time in 15-minute increments by pressing the TIME (+/-) button until the desired override time is selected. Or, press the HOLD button to override the schedule indefinitely.

Carrier Infinity Touch Thermostat Troubleshooting

If Infinity control does not power up:

1. Recheck wiring to ABCD on all devices.
2. Make sure all colors match for every terminal.
3. Make sure power is supplied to the indoor unit, and the amber LED is lit on indoor control circuit board.
4. Check for 24VAC between the C and D terminals at Infinity Control terminal connector and Damper Control Module.
5. Check fuse on indoor unit’s circuit board.

If Display says “Indoor Unit Not Found:”

1. Recheck wiring to ABCD on all devices.
2. Make sure all colors match for every terminal,
3. Press left-side button to try again.
4. If display still reads “Indoor Unit Not Found”, disconnect accessories and all devices from ABCD and connect User Interface directly to indoor unit with a short piece of thermostat wire. Add other devices one at a time to determine where the communication issue exists.

If display says “Outdoor Unit Not Found” (two-stage communicating outdoor unit):

1. Recheck wiring to ABCD connector on outdoor unit.
2. Make sure all colors match for every terminal.
3. Check for 24VAC between the C and D terminal connector of outdoor unit.

How to Program Carrier Infinity Thermostat

One Schedule for All Days

To create one comfort schedule that will repeat every day follow the instructions below:

1. Flip down the door at the bottom of the control.
2. Press the SCHEDULE button to access the schedule screen.
3. Press the ZONE button until the name of the zone you wish to program appears on the upper left screen. Selecting “ALL ZONES” allows you to create one schedule for the entire home.
4. Press either the LEFT or RIGHT button repeatedly until “ALLDAYS” is displayed.
5. The WAKE time period will be highlighted. Set the start time for this time period using the TIME (+/-) button.
6. Press the red HEAT button. Heating temperature will begin flashing.
7. Set the heating temperature using the TEMP (+/-) button.
8. Press the blue COOL button. Cooling temperature will begin flashing.
9. Set the cooling temperature using the TEMP (+/-) button.
10. Set the remaining periods, “DAY,” “EVENING,” AND “SLEEP” by using the SCROLL button to select a time period, then follow steps 5-9 to select temperature and time settings.
11. Exit the scheduling mode by either closing the door or pressing the SCHEDULE button.
12. Or, to create a custom schedule for the remaining zones, press the ZONE button to select the next zone you wish to program. Then repeat steps 4-10 in this section.

Daily Schedule

You can program a different schedule for each day of the week by using the SUNDAY, MONDAY, TUESDAY, WEDNESDAY, THURSDAY, FRIDAY and SATURDAY screens.

1. Flip down the door at the bottom of the control.
2. Press the SCHEDULE button to access the schedule screen.
3. Pres the ZONE button until the correct zone name that you want to program appears on the upper left screen. Selecting “ALL ZONES” allows you to simultaneously program one day across all zones.
4. If the word “SUNDAY,” “MONDAY,” “TUESDAY,” “WEDNESDAY,” “THURSDAY,” “FRIDAY,” or “SATURDAY” appears at the top of the screen, you are ready to start.
5. If not, press either the LEFT or RIGHT button repeatedly as necessary until the day of the week you want to select is displayed. The WAKE period will be highlighted.
6. Set the start time for this time period using the TIME (+/-) button.
7. Press the red HEAT button. Heating temperature will begin flashing.
8. Set the heating temperature using the TEMP (+/-) button.
9. Press the blue COOL button. Cooling temperature will begin flashing.
10. Set the cooling temperature using the TEMP (+/-) button.
11. Set the remaining periods, “DAY,” “EVENING,” AND “SLEEP” by using the SCROLL button to select a time period, then follow steps 5-9 to select temperature and time settings.
12. Repeat steps 5-11 in this section for each day you would like to schedule or use the COPY DAY function to copy a daily schedule to another day.
13. Exit the scheduling mode by either closing the door or pressing the SCHEDULE button.

Similarly, you can create a weekdays and weekend schedule by repeating steps 1-3 as described in the previous procedures, then selecting WEEKDAYS or WEEKEND respectively before proceeding.

Programming Fan Speed

You can select a different fan speed for each time period of your comfort schedule. Scheduling the fan speed follows similar basic steps as programming the time and temperature settings.

Follow these steps to program the fan speed:

1. Flip down the door at the bottom of the control.
2. Press the SCHEDULE button to access the schedule screen,
3. Press the ZONE button until the name of the zone you wish to program appears on the upper left screen. Selecting “ALL ZONES” allows you to create one schedule for the entire home.
4. Press the FAN button to access the Fan Speed programming screen.
5. Press the LEFT or RIGHT button to select the days you wish to program- ALLDAYS, WEEKDAYS, WEEKEND, or chose a specific day (MON, TUESM WED, etc.).
6. Using the TIME (+/-) button to select your desired fan speed- LOW, MED, HIGH or AUTO.
7. Use the SCROLL button to highlight the next period, then repeat steps 5 and 6 to select settings for DAY, EVENING and SLEEP.
8. Press the FAN button to return to the standard scheduling screen.
9. Or, you can exit the scheduling mode by either closing the door or pressing the SCHEDULE button.
10. Or, to create a customized fan speed schedule for the remaining zones, press the ZONE button to select the next zone you wish to program. Then repeat steps 5-7.

Carrier Infinity Thermostat Battery Replacement Guide

To replace batteries in a Carrier Infinity thermostat:

1. Locate the latch at the top of the thermostat. It is at the center of the top rim.
2. Press it down. This will disconnect the thermostat from the top of the wall plate.
3. Remove the thermostat from the wall bracket completely by bringing it slightly toward you and lifting it up and off the lip on the lower edge of the wall bracket.
4. Set the thermostat face down on a flat surface. You will see the batteries in the lower right corner.
5. Remove and discard the batteries.
6. Install new batteries by matching the polarity with the indicators in the space where the batteries sit.
7. Snap the batteries into place.
8. Put the thermostat back on the wall bracket.
9. Bring the thermostat back wall. Line up the latch at the top of the thermostat with the corresponding lip on the wall bracket.
10. Lightly push the thermostat toward the wall, until the latch and lip are line up properly.
11. Close the door.

Carrier Infinity Touch Thermostat Reset System Malfunction

The functions of the Carrier Infinity System thermostat include monitoring your air filter, humidifier pad and UV lamps. When any of these parts need maintenance, an alert will appear on the thermostat. To remove the alert from the screen, you need to reset the thermostat.

Follow these steps to reset a carrier Infinity system thermostat:

1. Hold the button next to the left arrow for several seconds until the “Accessory Status” screen is displayed. The names of the accessories appear on the screen.
2. Press the SCROLL button to scroll through the accessories. Choose “Filter” for the air filter, “Hum” for the humidifier pad, or “UV Lamps” for the UV lamps.
3. Reset the setting by pressing the button next to the right arrow.
4. Repeat the process with the remaining accessories by following steps 2 and 3.
5. Press the button next to the left arrow to exit the “Accessory Status” screen.

Carrier Infinity Indoor Unit Communication Fault

If a communication error exists, or equipment cannot be found by the user interface, this may be due to a wiring problem with any of the components or accessories of the system. An indoor unit communication fault is displayed when the user interface has lost communication with the indoor unit.

To troubleshoot the problem:

• Check voltages and wiring.
• Perform communication bus troubleshooting to isolate the problem to the appropriate piece of equipment. Following these steps:
• If cannot find indoor unit, disconnect outdoor unit and all other devices on ABCD bus except indoor unit and user interface. Cycle system power.
• Is indoor unit found? If yes, reconnect one device at a time to ABCD bus. If a device is not found, check the device wiring and correct the wiring and reinstall the system if the there is a problem with the wiring. If the device wiring is okay but the device is not found, measure the voltage on ABC terminals at the device. It is possible the device has a problem.
• If indoor unit is not found, connect user interface to the indoor unit at the indoor unit. Check if the indoor unit is found now. If yes, check the wiring to the user interface mounting location.
• If the indoor unit is still not found, try another user interface and check if the indoor unit is found. If yes, check wiring to user interface mounting location. If no, measure voltage on ABC terminals at the indoor unit. It is possible the indoor unit has a problem.

Carrier Thermostat Error Codes

Fan coil generated system malfunction events:

1. Code 37- Heater output sensed On when not energized (User interface will only display the pop-up message, modifications to fan/staging operation will not occur)
2. Code 44- Motor Communication Fault (ventilator, humidifier, dehumidifier, outdoor unit will be turned off)
3. Code 41- Blower Motor Fault (ventilator, humidifier, dehumidifier, outdoor unit will be turned off)
4. Code 45- Control failure

Furnace generated system malfunction events:

1. Code 13- Limit Circuit Lockout
2. Code 14- Ignition Lockout
3. Code 21- Gas Heating lockout
4. Code 22- Abnormal Flame Proving Signal
5. Code 23- Pressure Switch Did Not Open
6. Code 24- Secondary Voltage Fuse Open
7. Code 33- Limit Circuit Fault AND high heat only is active
8. Code 45- Control Circuitry Lockout
9. Code 41- Blower Motor Fault (cooling mode only) (ventilator, humidifier, dehumidifier, outdoor unit will be turned off)

For codes 13, 14, and 21, the system will use heat pump heating exclusively if available. When the error code is cleared or disappears, furnace heating will resume if still requested.

Outdoor unit generated system malfunction events:

1. Code 25- Invalid Model Plug
2. Code 45- Control Failure
3. Code 47- No 230V at unit
4. Code 48- Loss of Inverter Communications
5. Code 69- Inverter Internal Fault
6. Code 73- Contactor Shorted
7. Code 74- No High Voltage at Compressor
8. Code 76- Low Stage Didn’t Start Three Times
9. Code 78- High Stage Didn’t Start Three Times
10. Code 81- Thermal Lockout in Low Stage- 4 Hrs
11. Code 82- Thermal Lockout in High Stage-4 Hrs
12. Code 83- Low Pressure Lockout- 4 Hrs
13. Code 84- High Pressure Lockout- 4 Hrs
14. Code 85- Low Contactor Open
15. Code 86- Low Contactor Shorted
16. Code 87- High Contactor Open
17. Code 88-Inverter Temp Lockout or High Contactor Shorted
18. Code 96- VDC Under Voltage Lockout
19. Code 97- VDC Over Voltage Lockout
20. Code 99- High Torque Lockout

User Interface generated system malfunction events:

• Temp sensor failed, loss of communication with the smart sensor, smart sensor fault. “NO SENSOR DATA” shown
• Indoor unit communication fault
• Outdoor unit communication fault
• Packed product communication fault
• NIM communication fault
• SAM communication fault
• Possible Frozen Coil
• High Room Temp Alert, when 100^oF exists for at least 10 minutes, and removed when less than or equal to 98^oF exists
• Low Room Temp Alert, when 38^oF exists for at least 10 minutes, and removed when greater than or equal to 40^oF exists
• High Humidity Alert, when 80% Rh exists for 30 minutes, and removed when less than or equal to 78% Rh exists

Carrier Infinity Fault Code 178

Code 178 indicates Indoor unit printed circuit board, or 24 volt control circuit is non-functional. The issue may be caused by a bad thermostat, printed circuit board, or an oxidized wire connection.

To troubleshoot the issue:

1. Recheck wiring to ABCD connector on outdoor unit.
2. Make sure all colors match for every terminal.
3. Check for 24VAC between the C and D terminal connector of outdoor unit.

If all checks out with the wiring, the outdoor circuit board could be faulty. This needs a professional to troubleshoot and fix.

Carrier Infinity Fault Code 44

A fault code 44 is a blower calibration fault. This fault indicates that calculated blower motor speed is below 250 or above 1300 RPM.

1. Turn power off, wait 30 seconds, then restore power. Reset thermostat. Observe operation of furnace through 1 heating cycle.
2. If unit operate in low fire while flashing code 44, you have excessive restriction in air delivery system. Check filter(s) and duct work. If the problem still persists, replace furnace control board. Fix the problem.
3. Turn off power, wait 30 seconds, then restore power. Reset thermostat. Observe operation of furnace through 1 cooling cycle.
4. If fault code 44 occurs, you have excessive restriction in air delivery system. Check filter(s) and duct work. Furnace will operate in cooling mode at default speed. Check outdoor unit suction pressure and verify charge to determine if indoor airflow is sufficient.
5. Turn off power, wait 30 seconds, then restore power. Reset thermostat. Observe operation of furnace after it goes to high fire.
6. If the unit operates in high fire while flashing fault code 44, you have excessive restriction on air delivery system. Check filters and ductwork. Furnace blower will operate in high-fire speed at 1200 RPM. Check temperature rise of furnace and make sure the unit does not trip primary limit.

Carrier Infinity Fault Code 196

The fault code 196—auxiliary input (G) shutdowns could indicate a few different things, basically it is whatever the installer wired up the auxiliary alarm for, typically it is a backed up drain (float switch or drain pan switch).

Carrier Infinity Fault Code 41

A fault code 41 indicates blower motor fault. 41 codes may show up in fault history, but if the system is operating properly, this can be ignored.

If motor LED is lit and flashing and motor does not run:

1. Check status LED. If status LED is indicating  status code 41, motor control has detected that the motor will not come to speed within 30 seconds of being commanded to run or that the motor has been slowed to 250 rpm for more than 10 seconds after coming up to speed. Motor wiring harness and fan coil control are operating properly, don’t replace.
2. Check to be sure that the blower wheel is not rubbing the housing.
3. Check the motor to be sure that the motor shaft is not seized (Motor Control Module must be removed and electronics disconnected from windings to perform this check properly).
4. Check motor windings. If all these checks are normal, the Motor Control Module may need replacement.

Carrier Infinity Fault Code 179

If a fault code 179 appears on your Carrier Infinity thermostat, it indicates an outdoor unit communication error.

To clear the error:

1. Check the wiring. Make sure the wires are installed correctly and are not loose.
2. If the wiring is okay, check float switch on inside unit of the drain line. If it is tripped it will cause the unit not to communicate.

Carrier Infinity Not Cooling

Check the thermostat settings

Check the thermostat settings:

• If the thermostat is set for heating instead of cooling the air simply adjust the thermostat so it is set to cool or change the setting to auto so it will automatically change between cooling and heating as temperatures change.
• If the fan is set to “on”, the fan will run constantly even when the system isn’t cooling the air. This could result in warmer air blowing from the registers when the AC unit is not operating. Changing the fan setting to “auto” will resolve the issue by turning off the blower when the system is not actively cooling. If it is set to “off”, simply select “on” or “auto”.
• Check the temperature setting to make sure somebody else didn’t change it to a higher setting.
• If you have a programmable thermostat, review your “comfort schedule” for any issues, and make sure your programmed settings still match the times and temperatures you expect when you are home, away and asleep.
• Air filter is dirty

Lack of maintenance can lead to a clogged filter and blocked air flow. These can lead to loss of efficiency, discomfort, or even system failure. Before checking your air filter, be sure the thermostat is set for cooling and that the temperature setting is correct. If you still suspect the problem is a dirty filter, remove and clean or replace your air filter.

Refrigerant level is low

The refrigerant in your air conditioning system could be low. If your thermostat settings are correct and your air filter is clean, you may have a leak or other issue that is causing the refrigerant levels to drop. If you suspect low refrigerant levels, contact your local Carrier dealer to troubleshoot the air conditioner for refrigerant-based issues.

Evaporator coil is frozen

Excessive buildup of dust, dirt or other pollutants on the evaporator coil, excessively dirty or clogged air filter, excessive buildup of dirt, dust or debris on the outdoor condensing unit, and low refrigerant levels are some of the issues that can lead to a frozen evaporator coil. As the evaporator coil is typically not easily accessible and troubleshooting an AC’s refrigerant levels should be handled by a professional, you should shut down the system and contact your local Carrier dealing when you have a frozen evaporator coil.

Electrical panel issues

If there is no air coming from the registers, the house is too warm, and the system is not running at all, you might have lost power to the system. To troubleshoot, locate your home’s electrical panel (breaker box). Look for a blown fuse or a tripped circuit breaker that is not in the ON position.

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Faulty or broken condensing unit

A condensing unit might have an excessively dirty coil or refrigerant leakage. Other issues with the outdoor condensing unit might include a failing condenser fan motor, a faulty compressor or a faulty run capacitor, Most of these AC problems require a professional.

Carrier Infinity Thermostat Replacement

Before installing, modifying or servicing system, the main electrical disconnect switch must be in the OFF position. There may be more than 1 disconnect switch. Lock out and tag switch with a suitable warning label.

To install a Carrier Infinity thermostat replacement:

1. Turn off all power to equipment.
2. Remove existing control from wall.
3. Disconnect wires from existing control.
4. Discard or recycle old control.
5. Select Infinity Control mounting plastic.
6. Route wires through large hole in mounting plastic. Mark wall through two mounting holes.
7. Drill two 3/16-in mounting holes in the wall where marked.
8. Secure mounting plastic to the wall using two screws and anchors provided.
9. Adjust length and routing of each wire to reach each wire entry on the connector backplate. Strip 1/4-in of insulation from each wire.
10. Match and connect thermostat wire to proper terminals on User Interface backplate.
11. Push any excessive wire into the wall. Seal the hole in the wall to prevent any air leaks. Leaks can affect operation.
12. Attach Infinity Control to the mounting plastic by lining up the plastic guides on the back of the control with the opening on the mounting plate and push on.
13. Perform installation of all other system equipment.
14. Turn on power to equipment.

Thermal Lockout Code 82

If your outdoor unit generates a fault code 82, it means a Hi capacity thermal lockout. Thermal cutout occurs in three consecutive high cycles in new platform outdoor units. On older platform 2-stage units, or a combination of 3 hi and low cycles will cause this event.

Carrier Air Conditioner Reset Button

You may find your Carrier air conditioner needs resetting if it starts to malfunction, or refuses to respond to input via the control panel or remote. Resetting the AC restarts the internal computer and often restores the unit to normal working order. The exact instructions will vary depending on your Carrier AC model.

1. Locate the Reset button on the AC’s control panel. The button is sometimes very small but is usually labeled. In some cases, the button can be found beneath the digital display.
2. Press and hold the Reset button down for 3 seconds and then release the button. The unit may not respond to this step.
3. Press and hold the Reset button down for another 3 seconds. A light should flash on the display this time.
4. Wait a moment while the unit resets. Minor technical issues should be cleared.

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STEP

32.

Clean flame sensor with fine sandpaper and make sure it is properly positioned then

recheck current. Current is typically 4.0 to 6.0 microamps.

33.

Is current near typical value?

34.

Replace electrode.

35.

Will main burners ignite and stay on?

36.

Do you have burner pulsation's?

37.

Check the following:

- - Make sure perforated disks are in combustion- -air vent inlet.

- - Pressure tubing going to gas valve air pressure fitting for kinks.

- - Remove gas valve air pressure fitting and check gas valve for blockage.

- - Ensure vent and combustion- -air pipes are not reversed.

- - Burner orifice size and alignment.

- - Inadequate flame carryover.

- - Add restriction to combustion- -air pipe or lengthen a few feet if possible.

38.

While the unit is operating in low heat jumper R and W2.

39.

Do you have burner pulsation's in high heat?

40.

Turn off the power and disconnect the jumper across the R and W/W1 thermostat terminals.

41.

Turn power on and jumper R, W/W1, and W2 thermostat terminals.

42.

Do the main burners ignite?

43.

Do the main burners stay on longer than a few seconds?

44.

Do you have burner pulsation's?

45.

Disconnect jumper from R and W2.

46.

Do the main burners remain ON?

47.

Furnace will operate at low- -heat but will not ignite on low- -heat. Check the following:

- - Inadequate flame carryover.

- - Low manifold pressure. Reference installation instructions for proper low- -heat manifold

pressure.

- - Slow opening gas valve. Gas should flow at full pressure within 4 seconds after the gas

valve is energized.

- - Flame sensor location.

- - Air leakage around igniter bracket.

48.

Furnace will not operate or ignite on low- -heat. Check the following:

- - Flame sensor location.

- - Very low manifold pressure.

Reference installation instructions for proper low- -heat manifold pressure. Turn low- -heat

regulator adjustment clockwise 1/4 turn. Repeat until furnace will operate in low- -heat.

Then set to the proper manifold pressure. Re- -orifice if necessary.

Status Code 41

BLOWER MOTOR FAULT - - This status code indicates the blower failed to reach 250 RPM or the blower failed to com-

municate to the variable speed furnace control within 30 seconds after being turned ON or within 10 seconds during

steady- -state operation.

STEP

1.

Shut the power off, remove the blower access panel and disconnect the R thermostat lead

from the furnace control board.

2.

Turn the power on and depress the door switch. Use a piece of tape to hold it closed.

3.

Jumper the R and W/W1 thermostat terminals.

4.

Observe the operation of the furnace for the next 5 minutes or until fault occurs.

5.

Does status code 41 flash?

6.

Does a different status code flash?

7.

Go to page number indicated in the Index for the section covering the status code.

8.

Go to page number Indicated in Index for CLEANUP AND START- -UP INSTRUC-

TIONS.

9.

Did the blower motor turn ON and come up to speed before status code flashes?

10.

Remove tape from door switch and turn power off at main disconnect.

11.

Does the blower wheel rub against blower housing?

12.

Fix the problem.

13.

Does the blower wheel turn freely?

14.

Is blower wheel firmly mounted on motor shaft?

ACTION

ACTION

25

YES

NO

GO TO

33

35

34

8

8

13

37

38

8

39

37

8

41

42

43

25

44

27

37

45

46

47

48

8

8

YES

NO

GO TO

9

6

7

8

INDEX

INDEX

35

10

11

12

13

14

15

16

12

2

3

4

5

8