Trane Gas Furnaces: TUD / TDD /TUX / TDX Re: Furnace Lockout Codes / Diagnostic Codes INTEGRATED FURNACE CONTROL - ERROR CODES Flashing Slow Normal - No call for heat Flashing Fast Normal - Call for heat On Replace Control Off Check Power 2 Flashes ...

Trane Gas Furnace: TUD/TDD Re: No Heat - Code 2 Code 2 = 3 Failed Ignition Attempts Qty Possible Causes: 1 Bad Glow Plug Dirty Flame Sensor Clogged Burners No or Low Gas Pressure Bad Gas Valve Bad Ignition Control ...

Trane Gas Furnace: TUD1/TDD1 Re: Flashing Code 3 Code 3 = Pressure switch fault A Code 3 will result from either of the following conditions: Pressure switch contacts "closed" when they should be open. Pressure switch contacts "open" when they should be closed. ► If the pressure switch is...

Trane Gas Furnace: TUD Re: Flashing Code 7 Code 7 = Gas Valve Circuit Error Qty Possible Causes: Bad Control Board 1 Bad Gas Valve Bad Wiring CHECKOUT: 1. Check Gas Valve Disconnect line voltage power to the furnace. Unhook the 3-wire plug...

Trane Gas Furnace: TUD Re: Replacement Control Board The TUD gas furnace uses a 2-stage gas valve and 2-speed inducer. The Trane OEM control board is a Part# CNT03077 A suitable replacement is White-Rodgers Part# 21M51U-843 This is a kit that comes with the control board and a new...