York
York Furnaces Error Codes
Complete list of fault codes and troubleshooting guides. Use the search below to find your specific error.
Advertisements
1 FLASH
Furnace inducer starts but burners never light; LED shows 1 flash on York control board.
Ignition Failure / Lockout
10 FLASHES
York furnace shows 10 flashes and will not run; blower may run intermittently.
Gas Valve Circuit Error
11 FLASHES
Furnace intermittently shuts down; LED shows 11 flashes on some York models.
Limit Switch Lockout / Repeated Limit Trips
12 FLASHES
York furnace shows 12 flashes and may not respond to thermostat calls.
Blower Calibration / Blower Fault (ECM models)
13 FLASHES
Furnace LED shows 13 flashes; unit may not start or may shut down unexpectedly.
Limit Circuit Lockout / Rollout or Auxiliary Limit Open
2 FLASHES
York furnace starts inducer, but pressure switch does not close; LED shows 2 flashes.
Pressure Switch Open / Stuck Open
3 FLASHES
Inducer runs, ignitor glows, burners light briefly then shut off; LED shows 3 flashes on York board.
Pressure Switch Stuck Closed
4 FLASHES
Furnace blower runs but burners will not light; LED shows 4 flashes on York control board.
Open High Limit Switch
5 FLASHES
York furnace attempts ignition but shuts down quickly; LED shows 5 flashes.
Flame Sensed With Gas Valve Off / False Flame Signal
6 FLASHES
Furnace lights but shuts off after a few seconds; LED shows 6 flashes on York board.
Flame Failure / Flame Not Sustained
7 FLASHES
Furnace will not start heating cycle; LED shows 7 flashes on York control board.
Low Flame Sense / Flame Sense Lockout
8 FLASHES
York furnace blower runs continuously; LED shows 8 flashes.
Ignition Lockout / Too Many Retries
9 FLASHES
Furnace will not start; LED shows 9 flashes on York board.
Line Voltage Polarity / Ground Fault
BLOWER FLASH ONLY (NO HEAT)
Indoor blower runs continuously, no heat; York board LED indicates continuous fan mode or fan-only fault (no numeric code).
Stuck Fan Relay / Fan On with No Heat
Symptom
Burning or electrical smell when furnace runs.
Overheating Components / Electrical Overload
Symptom
Furnace blower never shuts off, even when thermostat is satisfied and set to AUTO.
Continuous Fan Operation
Symptom
Furnace blower runs but air from vents is cold.
No Heat Production
Symptom
Furnace burners light but shut off after 30–90 seconds; blower may or may not start.
High Limit Trip During Warm-Up
Symptom
Furnace cycles off when another large exhaust fan (kitchen, bath, dryer) runs.
Negative House Pressure / Combustion Air Starvation
Symptom
Furnace emits a strong gas smell when trying to ignite.
Gas Leak or Failed Ignition
Symptom
Furnace inducer starts, but you hear gurgling and furnace shuts down; often on cold days.
Condensate Back-Up in Inducer or Pressure Tubes
Symptom
Furnace is very loud at the return grille; whistling or roaring sound.
Return Air Restriction / Undersized Return
Symptom
Furnace makes loud banging or booming noise at startup.
Delayed Ignition
Symptom
Furnace occasionally trips the household circuit breaker.
Overcurrent / Electrical Short
Symptom
Furnace produces a high-pitched whine or screeching noise during operation.
Blower or Inducer Bearing Failure
Symptom
Furnace rattles or vibrates loudly when running.
Cabinet Vibration / Loose Components
Symptom
Furnace runs but carbon monoxide detector alarms when heating.
Combustion / Venting Hazard
Symptom
Furnace runs but house does not reach set temperature; supply air feels weak.
Insufficient Airflow / Undersized Blower Speed
Symptom
Furnace runs but some rooms are too hot while others are too cold.
Airflow Imbalance / Duct Distribution Issue
Symptom
Furnace short cycles: turns on and off frequently, runs for only a few minutes each time.
Short Cycling
Symptom
Furnace starts and stops repeatedly before reaching temperature; blower may continue to run.
Lockout and Auto-Reset Cycling
Symptom
Furnace will not start at all; no inducer, no blower, no LED lights on York control board.
No Power to Furnace
Symptom
Inducer motor runs continuously but furnace does not ignite; no specific fault code displayed.
Stuck Pressure Switch or Control Board Fault
Symptom
Thermostat calls for heat but furnace does nothing; LED on York board is steady (no fault).
No Call for Heat Reaching Furnace
Symptom
Water dripping from vent pipes or around flue connection on non-condensing York furnace.
Flue Condensation / Improper Venting
Symptom
Water leaking around the base of a high-efficiency (PVC vented) York furnace.
Condensate Leak
| Error Code | Symptom | Fault Type | Guide |
|---|---|---|---|
| 1 FLASH |
Furnace inducer starts but burners never light; LED shows 1 flash on York control board.
|
Ignition Failure / Lockout | View Details |
| 10 FLASHES |
York furnace shows 10 flashes and will not run; blower may run intermittently.
|
Gas Valve Circuit Error | View Details |
| 11 FLASHES |
Furnace intermittently shuts down; LED shows 11 flashes on some York models.
|
Limit Switch Lockout / Repeated Limit Trips | View Details |
| 12 FLASHES |
York furnace shows 12 flashes and may not respond to thermostat calls.
|
Blower Calibration / Blower Fault (ECM models) | View Details |
| 13 FLASHES |
Furnace LED shows 13 flashes; unit may not start or may shut down unexpectedly.
|
Limit Circuit Lockout / Rollout or Auxiliary Limit Open | View Details |
| 2 FLASHES |
York furnace starts inducer, but pressure switch does not close; LED shows 2 flashes.
|
Pressure Switch Open / Stuck Open | View Details |
| 3 FLASHES |
Inducer runs, ignitor glows, burners light briefly then shut off; LED shows 3 flashes on York board.
|
Pressure Switch Stuck Closed | View Details |
| 4 FLASHES |
Furnace blower runs but burners will not light; LED shows 4 flashes on York control board.
|
Open High Limit Switch | View Details |
| 5 FLASHES |
York furnace attempts ignition but shuts down quickly; LED shows 5 flashes.
|
Flame Sensed With Gas Valve Off / False Flame Signal | View Details |
| 6 FLASHES |
Furnace lights but shuts off after a few seconds; LED shows 6 flashes on York board.
|
Flame Failure / Flame Not Sustained | View Details |
| 7 FLASHES |
Furnace will not start heating cycle; LED shows 7 flashes on York control board.
|
Low Flame Sense / Flame Sense Lockout | View Details |
| 8 FLASHES |
York furnace blower runs continuously; LED shows 8 flashes.
|
Ignition Lockout / Too Many Retries | View Details |
| 9 FLASHES |
Furnace will not start; LED shows 9 flashes on York board.
|
Line Voltage Polarity / Ground Fault | View Details |
| BLOWER FLASH ONLY (NO HEAT) |
Indoor blower runs continuously, no heat; York board LED indicates continuous fan mode or fan-only fault (no numeric code).
|
Stuck Fan Relay / Fan On with No Heat | View Details |
| – |
Burning or electrical smell when furnace runs.
|
Overheating Components / Electrical Overload | View Details |
| – |
Furnace blower never shuts off, even when thermostat is satisfied and set to AUTO.
|
Continuous Fan Operation | View Details |
| – |
Furnace blower runs but air from vents is cold.
|
No Heat Production | View Details |
| – |
Furnace burners light but shut off after 30–90 seconds; blower may or may not start.
|
High Limit Trip During Warm-Up | View Details |
| – |
Furnace cycles off when another large exhaust fan (kitchen, bath, dryer) runs.
|
Negative House Pressure / Combustion Air Starvation | View Details |
| – |
Furnace emits a strong gas smell when trying to ignite.
|
Gas Leak or Failed Ignition | View Details |
| – |
Furnace inducer starts, but you hear gurgling and furnace shuts down; often on cold days.
|
Condensate Back-Up in Inducer or Pressure Tubes | View Details |
| – |
Furnace is very loud at the return grille; whistling or roaring sound.
|
Return Air Restriction / Undersized Return | View Details |
| – |
Furnace makes loud banging or booming noise at startup.
|
Delayed Ignition | View Details |
| – |
Furnace occasionally trips the household circuit breaker.
|
Overcurrent / Electrical Short | View Details |
| – |
Furnace produces a high-pitched whine or screeching noise during operation.
|
Blower or Inducer Bearing Failure | View Details |
| – |
Furnace rattles or vibrates loudly when running.
|
Cabinet Vibration / Loose Components | View Details |
| – |
Furnace runs but carbon monoxide detector alarms when heating.
|
Combustion / Venting Hazard | View Details |
| – |
Furnace runs but house does not reach set temperature; supply air feels weak.
|
Insufficient Airflow / Undersized Blower Speed | View Details |
| – |
Furnace runs but some rooms are too hot while others are too cold.
|
Airflow Imbalance / Duct Distribution Issue | View Details |
| – |
Furnace short cycles: turns on and off frequently, runs for only a few minutes each time.
|
Short Cycling | View Details |
| – |
Furnace starts and stops repeatedly before reaching temperature; blower may continue to run.
|
Lockout and Auto-Reset Cycling | View Details |
| – |
Furnace will not start at all; no inducer, no blower, no LED lights on York control board.
|
No Power to Furnace | View Details |
| – |
Inducer motor runs continuously but furnace does not ignite; no specific fault code displayed.
|
Stuck Pressure Switch or Control Board Fault | View Details |
| – |
Thermostat calls for heat but furnace does nothing; LED on York board is steady (no fault).
|
No Call for Heat Reaching Furnace | View Details |
| – |
Water dripping from vent pipes or around flue connection on non-condensing York furnace.
|
Flue Condensation / Improper Venting | View Details |
| – |
Water leaking around the base of a high-efficiency (PVC vented) York furnace.
|
Condensate Leak | View Details |
No matching codes found
Advertisements