York Gas Furnaces: TM8E Re: Diagnostic Codes / Fault Codes These York gas furnaces have a control board inside the furnace blower compartment that will flash a diagnostic code that shows the operating status of the furnace. !! Do Not go by the Fault Descriptions on the blower door - they are...

York Gas Furnace: TM8E Re: Flashing Code 3 If, after the induced draft blower is energized, the pressure switch does not close, the control will keep the inducer blower on and wait for the switch to close. The diagnostic code for this problem is 3 short flashes followed by a pause. ► The...