Goodman Furnace: External gas valve error (valve not energized when it should be)
External gas valve error (valve not energized when it should be) on a Goodman furnace: The control is calling for the gas valve and it isn't energizing. Before touching anything, turn the power off. This points at the valve circuit or the control relay, not the gas supply, so don't start poking at gas piping.
Applies to: 34.5 in chassis gas furnaces
Common causes of external gas valve error (valve not energized when it should be)
- Miswired gas valve circuit
- Open gas valve circuit
- Gas valve relay on the integrated control board stuck open
How to fix external gas valve error (valve not energized when it should be): step by step
- Shut off power at the disconnect before working on the valve wiring.
- Check the wiring in the gas valve circuit against the wiring diagram.
- Look for loose or broken connections and a pulled plug at the valve.
- With power restored and a call for heat, confirm the control is sending voltage to the valve.
- If voltage is present at the valve and it won't open, the valve is suspect and needs a licensed technician.
- If the relay is stuck open, replace the integrated control board with the correct part.
If the unit shows an error code, look it up: Goodman Furnace codes
Source: Goodman GMVC96 Service and Troubleshooting, p. 61. Written in our own words as a summary; always check the original manual.
General guidance for qualified technicians. The manufacturer's installation and service manual and local codes always take priority. Aurora Star Tech is not affiliated with, endorsed by or sponsored by any equipment manufacturer; brand and model names are used only to identify equipment and belong to their owners.