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Home > Error Codes > York
Every documented York furnace error code with causes, fixes, and the parts you may need. Also covers: Coleman, Luxaire.
Steady ON
Control Board Failure
Internal board fault. Replace the control board.
DIY check: Power cycle first. If solid ON persists, board replacement needed.
Common part needed: Shop Control Board →
Steady OFF
No Power
No power to the control board.
DIY check: Check breaker, switch, door switch, fuse, transformer.
Common part needed: Shop Transformer →
1 Flash
No Previous Error
No fault stored in memory. Normal status after power cycle.
DIY check: No action needed.
2 Flashes
System Lockout
Ignition retries exceeded. Hard lockout.
DIY check: Power cycle to reset. Then diagnose the ignition issue: gas supply, igniter, flame sensor.
Common part needed: Shop Igniter →
3 Flashes
Pressure Switch Error
Pressure switch did not close or reopened.
DIY check: Check condensate drain, vent, pressure hose, inducer motor.
Common part needed: Shop Pressure Switch →
4 Flashes
High Limit Switch Open
Overheating. Limit switch tripped.
DIY check: Check air filter, registers, blower motor, ductwork.
Common part needed: Shop Fan Motor →
5 Flashes
Flame Without Gas Valve
Flame detected when gas valve should be off. Safety concern.
DIY check: Turn off furnace and gas. Call a technician immediately.
Common part needed: Shop Gas Valve →
6 Flashes
Power / Voltage Issue
115V power problem or reversed polarity.
DIY check: Check wiring polarity and ground at the furnace.
7 Flashes
Gas Valve Fault
Gas valve circuit error.
DIY check: Check gas valve wiring and coil resistance. May need valve replacement.
Common part needed: Shop Gas Valve →
8 Flashes
Low Flame Signal
Weak flame sensor reading. Burners light but shut down quickly.
DIY check: Clean flame sensor with emery cloth. Check sensor wire.
Common part needed: Shop Flame Sensor →
9 Flashes
Ignition Failure / Lockout
Failed to ignite. May retry or lock out depending on attempts.
DIY check: Check gas supply, igniter, and gas valve. Clean flame sensor.
Common part needed: Shop Igniter →
10 Flashes
High Heat Pressure Switch
On two-stage models, the high-fire pressure switch fault.
DIY check: Check vent sizing for high-fire BTU rating. Check switch and hose.
Common part needed: Shop Pressure Switch →
11 Flashes
Rollout Switch Open
Flame detected outside combustion chamber.
DIY check: Do not reset without technician inspection. Possible heat exchanger issue.
12 Flashes
Blower Motor Speed Error
Blower not reaching target RPM.
DIY check: Check blower motor, capacitor, and wheel. Check for restricted ductwork.
Common part needed: Shop Fan Motor →
If the same code keeps coming back after you have addressed the obvious cause (dirty filter, flame sensor, etc.), or if you smell gas, see burn marks, or the furnace will not come out of lockout after a power cycle, call a licensed HVAC technician. Electrical and gas work carries real safety risk.