Luxaire
Luxaire Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
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1 FLASH
Furnace will not start; status LED shows 1 flash repeating; inducer and blower are off.
Ignition Failure Lockout
10 FLASH
Furnace does not respond to thermostat; status LED shows 10 flashes repeating; no call for heat recognized.
Communication or Thermostat Circuit Fault
11 FLASH
Furnace intermittently stops mid-cycle; status LED shows 11 flashes repeating; may restart on its own.
Blower Motor Fault or RPM Loss
12 FLASH
Furnace shows 12 flashes after power interruption; may not start immediately after power is restored.
Low Line Voltage or Brownout Lockout
13 FLASH
Furnace LED shows 13 flashes; unit may not start or may shut down unexpectedly.
Limit Circuit Lockout or Multiple Limit Trips
2 FLASH
Furnace attempts to start but shuts down quickly; status LED shows 2 flashes repeating; inducer may start then stop.
Pressure Switch Stuck Closed
24
Furnace LED displays code 24; no response to thermostat; 24V control circuit appears dead.
Secondary (24V) Fuse Open
3 FLASH
Furnace starts inducer but does not ignite; status LED shows 3 flashes repeating; unit may cycle the inducer several times.
Pressure Switch Stuck Open or Failed to Close
33
Furnace LED displays code 33; unit may run briefly then shut down; blower may continue to run.
Limit or Flame Rollout Switch Open
34
Furnace LED displays code 34; ignition sequence starts but burners do not light or light inconsistently.
Ignition Proving Failure
4 FLASH
Furnace lights but shuts off after a few seconds; status LED shows 4 flashes repeating; may retry ignition several times.
Flame Sense Failure
41
Furnace LED displays code 41; blower may run at incorrect speed or fail to start.
Blower Motor Fault (ECM or PSC)
42
Furnace LED displays code 42; inducer may not start or may run erratically.
Inducer Motor or Pressure Switch Error
44
Furnace LED displays code 44; unit may shut down unexpectedly during operation.
Flame Sense Out of Sequence or False Flame
5 FLASH
Furnace will not start heating cycle; status LED shows 5 flashes repeating; blower may run continuously.
Rollout Switch or Flame Rollout Trip
55
Furnace LED displays code 55; indicates control board memory or configuration error; furnace may not operate.
Control Board Fault or Configuration Error
6 FLASH
Furnace shuts down on high temperature; status LED shows 6 flashes repeating; blower may run continuously to cool the unit.
Limit Switch Open (Overtemperature)
7 FLASH
Furnace does not respond to thermostat; status LED shows 7 flashes repeating; no inducer or blower operation.
Lockout Due to Too Many Ignition Retries
8 FLASH
Furnace runs inducer and ignitor but gas valve does not open; status LED shows 8 flashes repeating.
Gas Valve Fault or Low Gas Pressure
9 FLASH
Furnace intermittently shuts down; status LED shows 9 flashes repeating; may be accompanied by blower running unexpectedly.
Line Voltage Polarity or Ground Fault
Symptom
Blower runs continuously even when there is no call for heat or cool.
Continuous Fan Operation
Symptom
Furnace blower starts and stops repeatedly without any heat call (fan surging).
Blower Control or ECM Module Issue
Symptom
Furnace cycles on and off frequently (short cycling) without reaching set temperature.
Short Cycling
Symptom
Furnace emits a burning dust smell when it starts, especially at the beginning of the season.
Dust Burn-Off on Heat Exchanger
Symptom
Furnace emits a strong chemical or burning plastic smell.
Electrical Overheating or Foreign Object in Duct
Symptom
Furnace makes loud booming or banging noise at startup.
Delayed Ignition
Symptom
Furnace produces a high-pitched whine or screech during operation.
Blower or Inducer Bearing Failure
Symptom
Furnace rattles or vibrates loudly when running.
Cabinet or Duct Vibration
Symptom
Furnace runs but carbon monoxide detector in the home alarms during operation.
Combustion or Venting Problem
Symptom
Furnace runs but does not produce enough heat; home never reaches set temperature.
Underfiring or Low Heat Output
Symptom
Furnace runs but some rooms are much colder than others.
Airflow Imbalance
Symptom
Furnace starts normally but shuts off when blower starts, then retries.
Flame Disturbance Due to Airflow
Symptom
Furnace starts then shuts off after a few minutes; blower continues to run with cool air.
Overheating and Limit Cycling
Symptom
Furnace will not start at all; no lights, no blower, no inducer.
No Power to Furnace
Symptom
Inducer motor runs but burners do not light; no error code displayed.
Ignition Sequence Interruption
Symptom
Rust-colored water or staining around furnace or vent connections.
Condensate Corrosion or Flue Leak
Symptom
Thermostat calls for heat but furnace only clicks and does not start inducer or blower.
Control Board Relay Failure or Low 24V Signal
Symptom
Water leaking around the base of the furnace, especially on high-efficiency (PVC vented) models.
Condensate Drain Leak or Blockage
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 FLASH |
Furnace will not start; status LED shows 1 flash repeating; inducer and blower are off.
|
Ignition Failure Lockout | View Details |
| 10 FLASH |
Furnace does not respond to thermostat; status LED shows 10 flashes repeating; no call for heat recognized.
|
Communication or Thermostat Circuit Fault | View Details |
| 11 FLASH |
Furnace intermittently stops mid-cycle; status LED shows 11 flashes repeating; may restart on its own.
|
Blower Motor Fault or RPM Loss | View Details |
| 12 FLASH |
Furnace shows 12 flashes after power interruption; may not start immediately after power is restored.
|
Low Line Voltage or Brownout Lockout | View Details |
| 13 FLASH |
Furnace LED shows 13 flashes; unit may not start or may shut down unexpectedly.
|
Limit Circuit Lockout or Multiple Limit Trips | View Details |
| 2 FLASH |
Furnace attempts to start but shuts down quickly; status LED shows 2 flashes repeating; inducer may start then stop.
|
Pressure Switch Stuck Closed | View Details |
| 24 |
Furnace LED displays code 24; no response to thermostat; 24V control circuit appears dead.
|
Secondary (24V) Fuse Open | View Details |
| 3 FLASH |
Furnace starts inducer but does not ignite; status LED shows 3 flashes repeating; unit may cycle the inducer several times.
|
Pressure Switch Stuck Open or Failed to Close | View Details |
| 33 |
Furnace LED displays code 33; unit may run briefly then shut down; blower may continue to run.
|
Limit or Flame Rollout Switch Open | View Details |
| 34 |
Furnace LED displays code 34; ignition sequence starts but burners do not light or light inconsistently.
|
Ignition Proving Failure | View Details |
| 4 FLASH |
Furnace lights but shuts off after a few seconds; status LED shows 4 flashes repeating; may retry ignition several times.
|
Flame Sense Failure | View Details |
| 41 |
Furnace LED displays code 41; blower may run at incorrect speed or fail to start.
|
Blower Motor Fault (ECM or PSC) | View Details |
| 42 |
Furnace LED displays code 42; inducer may not start or may run erratically.
|
Inducer Motor or Pressure Switch Error | View Details |
| 44 |
Furnace LED displays code 44; unit may shut down unexpectedly during operation.
|
Flame Sense Out of Sequence or False Flame | View Details |
| 5 FLASH |
Furnace will not start heating cycle; status LED shows 5 flashes repeating; blower may run continuously.
|
Rollout Switch or Flame Rollout Trip | View Details |
| 55 |
Furnace LED displays code 55; indicates control board memory or configuration error; furnace may not operate.
|
Control Board Fault or Configuration Error | View Details |
| 6 FLASH |
Furnace shuts down on high temperature; status LED shows 6 flashes repeating; blower may run continuously to cool the unit.
|
Limit Switch Open (Overtemperature) | View Details |
| 7 FLASH |
Furnace does not respond to thermostat; status LED shows 7 flashes repeating; no inducer or blower operation.
|
Lockout Due to Too Many Ignition Retries | View Details |
| 8 FLASH |
Furnace runs inducer and ignitor but gas valve does not open; status LED shows 8 flashes repeating.
|
Gas Valve Fault or Low Gas Pressure | View Details |
| 9 FLASH |
Furnace intermittently shuts down; status LED shows 9 flashes repeating; may be accompanied by blower running unexpectedly.
|
Line Voltage Polarity or Ground Fault | View Details |
| – |
Blower runs continuously even when there is no call for heat or cool.
|
Continuous Fan Operation | View Details |
| – |
Furnace blower starts and stops repeatedly without any heat call (fan surging).
|
Blower Control or ECM Module Issue | View Details |
| – |
Furnace cycles on and off frequently (short cycling) without reaching set temperature.
|
Short Cycling | View Details |
| – |
Furnace emits a burning dust smell when it starts, especially at the beginning of the season.
|
Dust Burn-Off on Heat Exchanger | View Details |
| – |
Furnace emits a strong chemical or burning plastic smell.
|
Electrical Overheating or Foreign Object in Duct | View Details |
| – |
Furnace makes loud booming or banging noise at startup.
|
Delayed Ignition | View Details |
| – |
Furnace produces a high-pitched whine or screech during operation.
|
Blower or Inducer Bearing Failure | View Details |
| – |
Furnace rattles or vibrates loudly when running.
|
Cabinet or Duct Vibration | View Details |
| – |
Furnace runs but carbon monoxide detector in the home alarms during operation.
|
Combustion or Venting Problem | View Details |
| – |
Furnace runs but does not produce enough heat; home never reaches set temperature.
|
Underfiring or Low Heat Output | View Details |
| – |
Furnace runs but some rooms are much colder than others.
|
Airflow Imbalance | View Details |
| – |
Furnace starts normally but shuts off when blower starts, then retries.
|
Flame Disturbance Due to Airflow | View Details |
| – |
Furnace starts then shuts off after a few minutes; blower continues to run with cool air.
|
Overheating and Limit Cycling | View Details |
| – |
Furnace will not start at all; no lights, no blower, no inducer.
|
No Power to Furnace | View Details |
| – |
Inducer motor runs but burners do not light; no error code displayed.
|
Ignition Sequence Interruption | View Details |
| – |
Rust-colored water or staining around furnace or vent connections.
|
Condensate Corrosion or Flue Leak | View Details |
| – |
Thermostat calls for heat but furnace only clicks and does not start inducer or blower.
|
Control Board Relay Failure or Low 24V Signal | View Details |
| – |
Water leaking around the base of the furnace, especially on high-efficiency (PVC vented) models.
|
Condensate Drain Leak or Blockage | View Details |
No matching codes found
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