TUH2/TDH2 - Diagnostic Codes

Trane Gas Furnaces: TUH2/TDH2

Re: Furnace Lockout Codes / Diagnostic Codes

FAULT CODE RECOVERY

On power up, the last 4 faults, if any, will be flashed on the Red LED.

• The newest fault detected will flash first and the oldest last.
• There will be a 2 second delay between fault code flashes.
• Solid Red LED error codes will not be displayed.
• The Green LED will be on solid during last fault recovery.  At any other time the control is powered, the Green LED indicator light will operate as shown in the table above and the Red LED will flash LitePort data (one flash) every 20 seconds.

​​​​​​​Fault Code Reset

The last 4 fault codes can be erased from memory by powering up the control with “G” energized and then applying “R” to the “W1” terminal 3 times within 6 seconds.

• The control will acknowledge the reset by turning on the red LED for 2 seconds.