Carrier Infinity Fault Codes | Explanations and Solutions

Carrier Infinity is one of the best, most reliable air conditioning units.  But like any other Carrier Infinity Fault Code, Occasionally, an issue may arise that hinders the AC’s ability to cool the surrounding area effectively. 

Being left exposed to scorching heat during summer can be pretty uncomfortable. Fortunately, if your AC displays fault codes, you can use them to determine the specific part that is malfunctioning and find a solution.

In many cases, the issues are simple and can be resolved quickly. Use this carrier infinity fault codes troubleshooting guide to fix your unit and beat the blistering heat the peak of summer brings.  

We will also look at some of the most common Carrier thermostat error codes and even the most expected carrier infinity furnace fault codes.

Troubleshooting carrier infinity fault codes – including carrier infinity thermostat error codes

You can use this detailed troubleshooting guide to service your carrier infinity unit. 

Carrier Infinity series HV AC systems can be diagnosed and fixed easily using Carrier Infinity fault codes. These codes are essential in identifying system malfunctions, enabling technicians to locate the issue quickly and efficiently.

We are excited to present a comprehensive guide on diagnosing Carrier Infinity fault codes. This guide will help you confidently address any problems that may arise. Let’s get started on a positive note!

Carrier Infinity Fault Codes

Outdoor units (assorted models) generate various carrier infinity error codes.

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

Fault Codes Explains: switch trip on Low pressure

Fault Code Description:  Monitoring of the switch

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

Fault code Description: Switch trip on High Pressure

The Potential cause and action: High-pressure switch trip. If there is a restriction in the airflow, recheck the refrigerant charge and the coils.

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

Fault Code Description: Issue with outside temperature Sensor

The Potential Cause and Action: Check the outside wiring of the temp Sensor. it may be lost communication with the outdoor unit.

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

Fault Code Description: Issue of Coil Temp Sensor 

The Potential Cause and Action: Please check the wiring and test the sensor for any faults.

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

Fault Code Description: Thermistor Range showing Error

The Potential Cause and Action: Incorrect connection between coil sensor and outdoor sensor. To ensure the proper functioning of the sensor, it must be placed outside the cabinet. Test the sensors for resistance and also check the wiring.

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

Fault Code Description: Contactor shorted.

The Potential Cause and Action: Normally, the voltage in the run capacitor is detected even when no compressor operation is required. It can be caused by a stuck contactor if it has been manually pushed in. 

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

Fault Code Description: Thermal Cutout Capacity Low.

The Potential Cause and Action: It is likely that the start relay failed to release or the internal compressor overloaded trip caused the voltage to disappear on the run capacitor when at low speed. Check these possibilities.

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

Fault Code Description: Thermal Cutout Capacity High.

The Potential Cause and Action: Voltage present on the capacitor on the run at high speed then disappears. The reason behind are internal compressor is getting overloaded trip, and starting the relay is failing to release.

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

Fault Code Description: No High Voltage to the outdoor unit.

The Potential Cause and Action: On the run, capacitor Voltage was not present when the compressor started. Potential triggers: High Voltage, disconnect, removed, or perhaps not connected. Check.

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

Fault Code Description: Low Capacity thermal Lockout 

The potential cause and action: On cycles, Thermal cutout is detected by control in 3 consecutive low stages.

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

Fault Code Description:  High Capacity Thermal Lockout

The potential cause and action: In the new platform outdoor units, Thermal cutout occurs in three consecutive high cycles. A combination of 3 high and low cycles will bring this fault on the older platform 2nd stage models.

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

Carrier thermostat error codes

Error Code 16

Fault code Description: System Communications Failure

Potential Cause and Action: Loss of communication with the user interface. Inspect wiring connections between the User Interface, indoor unit, and outdoor units.

Error Code 25

Fault code  Description:  Invalid Model Plug

Potential Cause and Action:  The control system isn’t detecting the correct model plug or detecting an invalid one. The unit won’t function without the correct model plug.

Error Code 31

Fault Description:  High-Pressure Switch Open

Potential Cause and Action: High-pressure switch trip. Verify refrigerant charge outdoor fan operation and check for possible airflow restrictions in coils.

Error Code 32

Fault code Description: Low-Pressure Switch Open

Potential Cause and Action:  Low-pressure switch trip. Re-check refrigerant charge and indoor airflow.

Error Code 45

Fault Description:  Control Fault

Potential Cause and Action:  Failure in the outdoor unit’s control board. Replacement of the board is necessary.

Error Code 46

Fault Description:  Brown Out (230V)

Potential Cause and Action: Line voltage dropped below 187 volts for at least four seconds. Fan and compressor operations are inhibited until the voltage exceeds 190 volts. Verify actual line voltage.

Error Code 47

Fault Description:  No 230V at Unit

Potential Cause and Action:  Lack of 230 volts at the contactor when the indoor unit is powered and requires cooling/heating. Confirm that the disconnect is closed and the 230V wiring is connected correctly.

Error Code 53

Fault Description: Outdoor Air Temp Sensor Fault

Potential Cause and Action:  The outdoor air sensor might be out of range or malfunctioning. Check the sensor’s resistance and inspect wiring connections.

Error Code 55

Fault Description:  Outdoor Coil Sensor Fault

Potential Cause and Action: Coil sensor reading may be out of range. Check the sensor’s resistance and wiring connections.

Error Code 56

Fault Description: Thermistors out-of-range

Potential Cause and Action: Improper readings between coil and outdoor air sensors. Check sensor resistances and inspect wiring connections.

Error Code 71

Fault Description:  Low-stage Thermal Cut-out

Potential Cause and Action:  Compressor action was detected and ceased during low-stage demand. Possible causes include compressor overload trip or prolonged circuit connection (where applicable).

Error Code 72

Fault Description: High-stage Thermal Cut-out

Potential Cause and Action:  Compressor operation was recognized and then stopped during high-stage demand. Reasons could include compressor overload trip or prolonged circuit connection (where applicable).

Error Code 73

Fault Description:  Contactor Shorted

Potential Cause and Action:** Compressor voltage is detected when there’s no demand for compressor action. Possible reasons: stuck closed contactor or wiring error.

Error Code 74

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

Potential Cause and Action: Compressor voltage not detected when it should be starting. Possible reasons: stuck closed contactor or wiring error.

Error Code 75

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

Potential Cause and Action: The specified start voltage at VR terminal wasn’t achieved in the 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: The low stage didn’t start three consecutive times due to the specified start voltage not being achieved at VR terminal. The low stage is locked out for 30 minutes.

Error Code 77

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

Potential Cause and Action: The specified start voltage at the VS terminal was not attained in high-stage. The start relay de-energized after one second.

Error Code 78

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

Potential Cause and Action:  High-stage failed to start three consecutive times due to the specified start voltage not reaching the VS terminal. The high stage is locked out for 30 minutes.

Error Code 81

Fault Description:  Low-stage Thermal Lockout

Potential Cause and Action:  Thermal cut-out occurs in three consecutive low/high-stage cycles. The low stage is locked out for 4 hours or until 24 volts of power is recycled.

Error Code 82

Fault Description: High-stage Thermal Lockout

Potential Cause and Action:  Thermal cut-out occurs in three consecutive high/low-stage cycles. The high stage is locked out for 4 hours or until 24 volts of power is recycled.

Fault code 87

Error code description: Open high Contactor (24ANA7 only)

Cause and action: At the compressor’s start, voltage could not be sensed. high-stage contactor could be stuck open/there could be some wiring error.

Fault code 85

Error code description: Open Low Contactor (24ANA7 only)

Cause and action:  Compressor voltage was not sensed when the compressor started. There could be a wiring issue, or The low-stage contactor could be open or stuck.

Fault code 84

Error code Description: Lock Out On High Pressure

Cause and action: Can switch trip on high pressure, which happened during 3 consecutive cycles. The unit can lock out operation until the 24V power is recycled or for 4 hours.

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

Error code 16

Fault Code Description: Communications Loss

Error code 25

Fault Code Description: Invalid model

Error code 31

Fault Code Description:  High-Pressure Switch Open (Reset Time: Minimum of 15 minutes)

Error code 32

Fault Code Description: Low-Pressure Trip (Reset Time: Minimum of 15 minutes)

Error code 45

Fault Code Description:  Control Fault

Error code 46

Fault Code Description: Brownout Event (Reset Time: Minimum of 6 minutes)

Carrier Infinity Fault Codes – Carrier Infinity Furnace Fault Codes

Error code 12

Fault Description: Blower On After Power Up

Potential Cause and Action: Occurs when the call for heat satisfies during blower on delay.

Error codes 13/14/15

Fault Description: Limit Circuit Lockout

Auto reset in 3 hours

Error code 21

Fault Description: Gas Heating Lockout

Attention is needed as the 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: This may occur during quick power interruptions.

Error code 25

Fault Description: Model Selection Or Setup Error 

Final Words on Carrier Infinity Fault Codes Troubleshooting:

This guide provides insight into diagnosing potential issues based on the fault codes displayed by Carrier Infinity systems and furnaces. It’s important to note that these codes should be used as guidelines and not relied upon blindly. Always apply your knowledge, experience, and common sense alongside these guidelines to effectively troubleshoot and identify the root cause. Trust your instincts during diagnostics to expedite the troubleshooting process.

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