York 80% Gas Furnace: GY8S Re: Flashing Code 3 Code 3 = Furnace Pressure Switch failed to close on a call for heat. This gas furnace has a single pressure switch which monitors for proper venting. Qty Possible Causes: 2 Bad Inducer Motor 1 Bad Pressure Switch ...

York 80% Gas Furnace: GY8S Re: Flashing Code 7 / Error Code 7 Flashing Code 7 = Lockout due to ignition retries. Caused by multiple failed ignition attempts. ► Code 7 is a Hard Lockout that disables heat operation and must be reset by cycling power to the furnace or by turning the thermostat...

York 80% Gas Furnace: GY8S Re: Won't Ignite Failure to ignite should result in Flashing Code 7 = Lockout due to ignition retries. Caused by multiple failed ignition attempts. ► Code 7 is a Hard Lockout that disables heat operation and must be reset by cycling power to the furnace or by turning...