Carrier infinity fault codes – description and how to fix your unit

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 including carrier infinity thermostat fault codes

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

Carrier Infinity fault codes are used to diagnose and troubleshoot issues with Carrier Infinity series HVAC systems. These fault codes provide valuable information about the system’s malfunctions and can help technicians pinpoint the problem more efficiently. Here’s a general guide on how to diagnose Carrier Infinity fault codes:

Carrier infinity fault codes -Outdoor Unit Generated carrier infinity 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 carrier infinity codes (commonest)

Flash error code	Fault description
16	System Commu-nications fault
25	Invalid Model/Motor Selection
26	Invalid Heater Size
27	Invalid Outdoor Unit Size
36	Heater output not sensed when energized
37	Heater output sensed On when not energized
41	Blower Motor Fault
44	Motor communication Fault
46	Brown Out Condition

 

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 words

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.

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