HVACopediaGoodman · Furnace troubleshooting
Internal gas valve error (valve energized when it should not be)
What is going on
Gas valve energized with no call. Bad one. Valve shouldn't have power unless the control asks. Kill power first.
Likely causes
- Miswired gas valve circuit
- Shorted gas valve wiring putting voltage on the valve
- Gas valve relay on the integrated control board stuck, not following the call
Check in this order
- Power off before you touch it.
- Check the wiring in the gas valve circuit, look for pinched or shorted leads.
- Compare to the wiring diagram, find any miswire.
- With the thermostat satisfied, power up and see if the valve still gets voltage.
- Voltage with no call, control relay is the problem. Replace the integrated control board with the correct part.
- If gas flows with no call, shut the gas off and bring in a licensed tech.
Applies to: 34.5 in chassis gas furnaces
More furnace guides
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- Alternate combustion air opening (upflow or horizontal)
- Alternate vent/flue location (upflow or horizontal left)
- Annual inspection checklist
- Auxiliary limit control (location and purpose)
- Auxiliary limit switch open (blower compartment)
Take it to the job
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Source: Goodman GMVC96 Service and Troubleshooting, p. 62. Written in our own words; check the manual for your exact model.
For licensed technicians. Gas, electrical and refrigerant work must be done by a qualified, licensed person. Shut off power and gas before servicing, never bypass a safety control, and follow the manufacturer’s manual for the exact model; it and local codes always take priority. HVACopedia is not affiliated with any manufacturer; brand and model names only identify the equipment.