This York gas furnaces has a control board inside the furnace blower compartment that will flash a diagnostic code that shows the operating status of the furnace.

Diagnostic Codes:
Steady On Red	Control failure	Replace control board (S9200U is a suitable replacement)
Rapid Red	Low flame signal	Dirty flame sensor
1 Red	Ignition lockout	Bad glow plug Dirty flame sensor Gas supply issue
2 Red	Pressure switch stuck closed	Bad pressure switch Inducer fan relay stuck on
3 Red	Pressure switch stuck open	Bad pressure switch Bad inducer fan Bad inducer fan relay Blocked or restricted vent Condensate drainage issue
4 Red	Aux or Spill Limit Open	Bad limit Low airflow Over-Fired
5 Red	Rollout switch open / open fuse	Bad switch Cracked heat exchanger Bad inducer motor Over-Fired
6 Red*	Pressure switch opened 4 times	Bad pressure switch Bad inducer fan Blocked or restricted vent Condensate drain issue
7 Red*	Ignition lockout due to 3 retries	Bad igniter Dirty flame sensor No gas flow
8 Red	Flame signal lost 5 times	Dirty flame sensor Combustion air problem
9 Red	Grounding or line polarity fault	Try reversing transformer power
11 Red	No or improper ground
* Code 6 & 7 will auto reset after 1 hour.

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Article ID: 492

Last updated: 14 Feb, 2018

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