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York Error Codes & Fault Codes

Complete LED flash code reference for York, Coleman, and Luxaire furnaces. Bookmark this page for quick field lookups.

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CodeDescription
1 flashNo previous error code
2 flashesControl lockout
3 flashesPressure switch error
4 flashesOpen limit circuit
5 flashesFlame sense fault
6 flashesIgnition failure
7 flashesLimit circuit lockout
Steady ONNormal standby
Steady OFFNo power

Detailed Code Reference

1 flash
No previous error code
Cause: Normal after reset
Fix: No action needed
2 flashes
Control lockout
Cause: Repeated ignition failure
Fix: Power cycle to reset, diagnose ignition system
3 flashes
Pressure switch error
Cause: Inducer or draft issues, blocked flue
Fix: Check inducer motor, clear flue obstruction, test pressure switch
4 flashes
Open limit circuit
Cause: High temperature limit tripped or low airflow
Fix: Check filter and airflow, verify blower operation
5 flashes
Flame sense fault
Cause: Flame without gas call or faulty sensor
Fix: Check gas valve, inspect flame sensor
6 flashes
Ignition failure
Cause: No flame established, bad igniter, or no gas
Fix: Check igniter, verify gas supply and pressure
7 flashes
Limit circuit lockout
Cause: Limit switch tripped multiple times
Fix: Address root cause of overheating, check for duct restrictions
Steady ON
Normal standby
Cause: Normal
Fix: No action needed
Steady OFF
No power
Cause: No voltage to board
Fix: Check power supply and transformer

Frequently Asked Questions

What does York error code 6 flashes mean?

Six flashes on a York furnace indicates ignition failure, meaning no flame was established during the ignition attempt. Check the hot surface igniter for cracks or open circuit, verify the gas supply is on and at correct pressure, and clean the flame sensor.

What does York error code 3 flashes mean?

Three flashes on a York furnace indicates a pressure switch error. This is typically caused by inducer motor or draft issues, or a blocked flue. Check the inducer motor operation, clear any flue obstructions, and test the pressure switch with a manometer.

How do I reset a York furnace after lockout?

A York furnace showing 2 flashes is in control lockout due to repeated ignition failure. Power cycle the furnace by turning off the breaker for 30 seconds. Before resetting, diagnose the ignition system: check the igniter, gas supply, and flame sensor.

Are York, Coleman, and Luxaire error codes the same?

Yes. York, Coleman, and Luxaire are all manufactured by Johnson Controls. They share the same control boards and LED flash code systems, so all error codes listed here apply to all three brands.

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