York Furnace Error Codes

Flame detected when the gas valve should be off

Pressure switch was closed at the wrong time

Pressure-switch circuit did not close

Limit circuit opened

Flame-rollout safety lockout

Pressure-switch cycle lockout

Ignition or flame-proving failure

Flame-loss recycle lockout

Power polarity or grounding fault

Gas flow without a heat call

Extended limit-open lockout

Igniter circuit fault