York Gas Furnace: YP9C / PC9 Re: Flashing Code 7 Code 7 = Failure to Sense Flame (3 attempts) ► If flame cannot be established in three tries, the control will lockout for one hour and then automatically try again to light. Qty Possible Causes: 5 Dirty Flame Sensor 2...

York Gas Furnace: YP9C Re: Flashing Code 8 Code 8 = Flame was established but then lost 5 times. Qty Possible Causes: 2 Dirty Flame Sensor Exhaust Leak in Cabinet CHECKOUT: 1. Check Ignition Sequence If the furnace is running, turn the thermostat off and...

York Gas Furnace: YP9C Re: Flashing Code 11 This indicates that a primary limit switch has opened and has remained open for more than five minutes. This condition is usually associated with an air circulation failure. ► Code 11 is a Hard-Lockout which requires cycling 24VAC power to the...