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 at the gas valve.
- Check the resistance of the gas valve coil windings ("C" to "PM").
- Windings Open = Bad Gas Valve
- Windings Show Resistance ⇒
- Re-attach the 3-wire plug at the gas valve.
- Unplug the 12-Pin plug from the ignition control board.
- Check resistance between Pins 7 (RD/I) and 8 (BL/I).
- No Resistance = Bad Wiring between Gas Valve & Ignition Control Board.
2. Check Control Board
- Re-attach the 12-Pin plug to the Ignition Control Board.
- Re-attach the 3-Pin plug to the gas valve (if loose).
- Re-apply power to the furnace.
- Energize a call for heat.
- Still Flashes Code 7 = Bad Control Board