York Furnace Error Codes — Complete Guide

York, Coleman, and Luxaire (all Johnson Controls brands) use a RED LED flash code system. Green = normal, red = fault. Count red flashes between pauses. Also covers Coleman, Luxaire.

All York Error Codes

1 red flash

York 1 Red Flash — Flame Sensed With Gas Valve Closed

Flame detected when gas valve closed — leaky valve.

2 red flashes

York 2 Red Flashes — Pressure Switch Stuck Closed

Pressure switch stuck closed.

3 red flashes

York 3 Red Flashes — Pressure Switch Stuck Open

Pressure switch open during inducer operation.

4 red flashes

York 4 Red Flashes — Limit Switch Open

Limit switch open — overheating. Usually restricted airflow.

5 red flashes

York 5 Red Flashes — Roll Out Switch Open (SAFETY)

Flame rollout switch tripped — possible cracked heat exchanger and CO risk.

6 red flashes

York 6 Red Flashes — Locked Out on Pressure Switch Error

Pressure switch lockout after persistent errors.

7 red flashes

York 7 Red Flashes — Ignition Lockout

Locked out after too many ignition attempts.

8 red flashes

York 8 Red Flashes — Locked Out on Repeated Power Cycles

Locked out due to frequent power cycling.

9 red flashes

York 9 Red Flashes — Grounding or Polarity Issue

Grounding or polarity issue — wiring fault.

10 red flashes

York 10 Red Flashes — Gas Flows With Valve Closed

Gas continues to flow when valve should be closed — faulty valve.

11 red flashes

York 11 Red Flashes — Limit Open Over 5 Minutes

Limit switch open more than 5 minutes — usually failed blower.

12 red flashes

York 12 Red Flashes — Open Igniter Circuit

Open igniter circuit — failed igniter or wiring fault.

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York Furnace Error Codes — Complete Guide

All York Error Codes

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