Bryant
Bryant Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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11
Furnace does not start; status LED shows code 11 (one short, one long flash), indicating no previous code stored.
Normal Power-Up / No Fault Stored
12
Furnace attempts to start but stops; status LED shows code 12 (blower on after power-up).
Blower On After Power-Up / Normal Post-Power Cycle
13
Furnace shuts down; LED flashes code 13, indicating limit switch lockout or flame rollout lockout (depending on model).
Limit or Flame Rollout Lockout
14
Furnace attempts ignition but locks out; LED shows code 14 (ignition lockout).
Ignition Lockout
21
Furnace stops and LED shows code 21, indicating gas heating lockout (often after multiple failed ignition attempts).
Gas Heating Lockout
23
Furnace LED shows code 23; unit may not start or may shut down shortly after starting the inducer.
Pressure Switch Did Not Close
24
Furnace LED shows code 24; blower may run but no heat, or the furnace may be completely inoperative.
Secondary Voltage Fuse Open / 24V Control Circuit Fault
31
Furnace LED shows code 31; inducer may run but burners do not light, or the unit shuts down mid-cycle.
Pressure Switch Open or Failed to Close
32
Furnace LED shows code 32; the blower may run at low speed, with limited or no heat output.
Low Heat Pressure Switch Open
33
The furnace runs briefly then shuts down; the LED shows code 33 (limit or flame rollout open). The blower may continue to run.
High Limit or Flame Rollout Switch Open
34
Furnace LED shows code 34; the ignitor may glow, but burners fail to light or light inconsistently.
Ignition Proving Failure
41
Furnace LED shows code 41; the blower may run at an incorrect speed, or airflow seems weak.
Blower Motor Fault / CFM Fault
42
Furnace LED shows code 42; the unit may short-cycle or fail to respond correctly to thermostat calls.
Inducer or Blower Communication Fault (ECM/Variable-Speed Models)
43
Furnace LED shows code 43; the unit may not modulate correctly or may stay in one stage.
Pressure Switch Calibration or Modulation Fault
44
Furnace LED shows code 44; the unit may shut down unexpectedly or not respond to the thermostat.
Control Board Internal Fault
45
Furnace LED shows code 45; the furnace may lock out and require power cycling to restart.
Control Circuit Lockout
55
Furnace LED shows code 55, indicating no previous fault stored in memory.
No Fault in Memory
Symptom
Bryant communicating furnace displays communication error with thermostat; furnace may revert to default operation or not run.
Communicating Control Network Fault
Symptom
Furnace blower starts and stops repeatedly without burner ignition; cool air may blow briefly.
Fan-Only or Control Board Misoperation
Symptom
Furnace cycles on and off rapidly (every few minutes) and the thermostat temperature overshoots or undershoots.
Thermostat or Control Calibration Issue
Symptom
Furnace ignites and runs but shuts off when the blower starts; burners relight after blower stops.
Blower-Induced Flame Disturbance or Ground Fault
Symptom
Furnace runs but some rooms are too hot while others are too cold.
Uneven Heating / Zoning or Duct Imbalance
Symptom
Furnace runs but the carbon monoxide detector in the home activates during operation.
Combustion / Venting Safety Hazard
Symptom
Furnace starts but shuts down with a loud click shortly after ignition; house smells like exhaust.
Flame Rollout or Blocked Heat Exchanger
Symptom
Strong burning or electrical smell when the furnace runs.
Overheating Components or Debris on Heat Exchanger
Symptom
The burners light but extinguish after a few seconds; the furnace retries several times then locks out.
Flame Sensing Failure
Symptom
The furnace or ductwork produces a high-pitched whistling noise during operation.
Airflow Restriction Noise
Symptom
The furnace produces heat, but airflow from the registers is weak; some rooms remain cold.
Insufficient Airflow
Symptom
The furnace runs but makes loud banging or booming noises at startup or shutdown.
Delayed Ignition or Duct Expansion Noise
Symptom
The furnace starts and runs but shuts off before reaching the thermostat setpoint; this results in frequent short cycles.
Short Cycling
Symptom
The furnace will not start at all; there is no blower, no inducer, and no LED lights on the control board.
No Power to Furnace
Symptom
The indoor blower runs continuously even when the thermostat is not calling for heat or fan.
Blower Stuck On
Symptom
The inducer starts, the ignitor glows, but the burners do not light; after several attempts, the furnace shuts down.
Failure to Ignite Burners
Symptom
The thermostat calls for heat, but the furnace inducer never starts; the LED is on and shows a normal or no-fault indication.
Inducer Motor Failure or Inducer Circuit Fault
Symptom
Water is dripping from the metal vent pipe on an 80% Bryant furnace or staining the ceiling above the furnace.
Flue Condensation / Venting Problem
Symptom
Water is leaking around the base of a high-efficiency (PVC vented) Bryant furnace.
Condensate Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 11 |
Furnace does not start; status LED shows code 11 (one short, one long flash), indicating no previous code stored.
|
Normal Power-Up / No Fault Stored | View Details |
| 12 |
Furnace attempts to start but stops; status LED shows code 12 (blower on after power-up).
|
Blower On After Power-Up / Normal Post-Power Cycle | View Details |
| 13 |
Furnace shuts down; LED flashes code 13, indicating limit switch lockout or flame rollout lockout (depending on model).
|
Limit or Flame Rollout Lockout | View Details |
| 14 |
Furnace attempts ignition but locks out; LED shows code 14 (ignition lockout).
|
Ignition Lockout | View Details |
| 21 |
Furnace stops and LED shows code 21, indicating gas heating lockout (often after multiple failed ignition attempts).
|
Gas Heating Lockout | View Details |
| 23 |
Furnace LED shows code 23; unit may not start or may shut down shortly after starting the inducer.
|
Pressure Switch Did Not Close | View Details |
| 24 |
Furnace LED shows code 24; blower may run but no heat, or the furnace may be completely inoperative.
|
Secondary Voltage Fuse Open / 24V Control Circuit Fault | View Details |
| 31 |
Furnace LED shows code 31; inducer may run but burners do not light, or the unit shuts down mid-cycle.
|
Pressure Switch Open or Failed to Close | View Details |
| 32 |
Furnace LED shows code 32; the blower may run at low speed, with limited or no heat output.
|
Low Heat Pressure Switch Open | View Details |
| 33 |
The furnace runs briefly then shuts down; the LED shows code 33 (limit or flame rollout open). The blower may continue to run.
|
High Limit or Flame Rollout Switch Open | View Details |
| 34 |
Furnace LED shows code 34; the ignitor may glow, but burners fail to light or light inconsistently.
|
Ignition Proving Failure | View Details |
| 41 |
Furnace LED shows code 41; the blower may run at an incorrect speed, or airflow seems weak.
|
Blower Motor Fault / CFM Fault | View Details |
| 42 |
Furnace LED shows code 42; the unit may short-cycle or fail to respond correctly to thermostat calls.
|
Inducer or Blower Communication Fault (ECM/Variable-Speed Models) | View Details |
| 43 |
Furnace LED shows code 43; the unit may not modulate correctly or may stay in one stage.
|
Pressure Switch Calibration or Modulation Fault | View Details |
| 44 |
Furnace LED shows code 44; the unit may shut down unexpectedly or not respond to the thermostat.
|
Control Board Internal Fault | View Details |
| 45 |
Furnace LED shows code 45; the furnace may lock out and require power cycling to restart.
|
Control Circuit Lockout | View Details |
| 55 |
Furnace LED shows code 55, indicating no previous fault stored in memory.
|
No Fault in Memory | View Details |
| – |
Bryant communicating furnace displays communication error with thermostat; furnace may revert to default operation or not run.
|
Communicating Control Network Fault | View Details |
| – |
Furnace blower starts and stops repeatedly without burner ignition; cool air may blow briefly.
|
Fan-Only or Control Board Misoperation | View Details |
| – |
Furnace cycles on and off rapidly (every few minutes) and the thermostat temperature overshoots or undershoots.
|
Thermostat or Control Calibration Issue | View Details |
| – |
Furnace ignites and runs but shuts off when the blower starts; burners relight after blower stops.
|
Blower-Induced Flame Disturbance or Ground Fault | View Details |
| – |
Furnace runs but some rooms are too hot while others are too cold.
|
Uneven Heating / Zoning or Duct Imbalance | View Details |
| – |
Furnace runs but the carbon monoxide detector in the home activates during operation.
|
Combustion / Venting Safety Hazard | View Details |
| – |
Furnace starts but shuts down with a loud click shortly after ignition; house smells like exhaust.
|
Flame Rollout or Blocked Heat Exchanger | View Details |
| – |
Strong burning or electrical smell when the furnace runs.
|
Overheating Components or Debris on Heat Exchanger | View Details |
| – |
The burners light but extinguish after a few seconds; the furnace retries several times then locks out.
|
Flame Sensing Failure | View Details |
| – |
The furnace or ductwork produces a high-pitched whistling noise during operation.
|
Airflow Restriction Noise | View Details |
| – |
The furnace produces heat, but airflow from the registers is weak; some rooms remain cold.
|
Insufficient Airflow | View Details |
| – |
The furnace runs but makes loud banging or booming noises at startup or shutdown.
|
Delayed Ignition or Duct Expansion Noise | View Details |
| – |
The furnace starts and runs but shuts off before reaching the thermostat setpoint; this results in frequent short cycles.
|
Short Cycling | View Details |
| – |
The furnace will not start at all; there is no blower, no inducer, and no LED lights on the control board.
|
No Power to Furnace | View Details |
| – |
The indoor blower runs continuously even when the thermostat is not calling for heat or fan.
|
Blower Stuck On | View Details |
| – |
The inducer starts, the ignitor glows, but the burners do not light; after several attempts, the furnace shuts down.
|
Failure to Ignite Burners | View Details |
| – |
The thermostat calls for heat, but the furnace inducer never starts; the LED is on and shows a normal or no-fault indication.
|
Inducer Motor Failure or Inducer Circuit Fault | View Details |
| – |
Water is dripping from the metal vent pipe on an 80% Bryant furnace or staining the ceiling above the furnace.
|
Flue Condensation / Venting Problem | View Details |
| – |
Water is leaking around the base of a high-efficiency (PVC vented) Bryant furnace.
|
Condensate Leak | View Details |
No matching codes found
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