York Gas Furnaces: PMPD Re: Diagnostic/Lockout Codes 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 ...

York Gas Furnace: PMPD/PDPD Re: Flashing Code 1 Code 1 = Failure to Sense Flame (3 Failed Ignition Attempts) Qty Possible Causes: 1 Dirty Flame Sensor 1 Bad Glow Plug 1 Clogged Burners No or Low Gas Pressure 1 Bad Gas Valve Bad Ignition...

York 90% Gas Furnace: P*MPD 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: 1 Bad Inducer Motor 1 Bad Pressure Switch ...

York Gas Furnace: PMPD/PDPD Re: Flashing Code 5 Flashing Code 5 = Rollout Switch Open There are up to three manual-reset rollout limits mounted around the burners. Other symptoms associated with a Code 5: Blower and Inducer Running Continuous No Heat Qty Possible Causes: ...

Gas Furnace Re: Blown Low Voltage Fuse The low voltage fuse provides protection for the control board and other low voltage components in the case of high amperage caused by a low voltage short or excess component load. ► The fuse must be sized per the "VA" of the transformer. Amps = VA...

Gas Furnace Re: No Heat - Code 7 (Assuming original control board) Code 7 = Failure to Sense Flame Qty Possible Causes: 2 Dirty Flame Sensor 2 Bad Glow Plug Clogged Burners No or Low Gas Pressure Bad Gas Valve CHECKOUT: 1....

Gas Furnace Re: Multiple Attempts to Fire The gas furnace burners ignite and shut-off several times before eventually burning normally. Qty Possible Causes: 1 Low Flame Signal Pressure Switch Fault Bad Control Board Thermostat Issue ...