F4
Peerless
Gas Valve Circuit Fault
Boiler shows F4 and will not fire; may be labeled 'Gas Valve Error'
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Safety Warning
This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.
If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.
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Possible Causes
Open gas valve coil, shorted gas valve wiring, failed control relay, incorrect gas valve wiring
How to Fix / Troubleshooting
Safety first: Turn off power and close the gas shutoff valve. Gas work must comply with local codes.
Steps:
- Inspect wiring: Check the harness from the control board to the gas valve for loose or damaged wires.
- Check for shorts: Look for wires pinched under panels or touching hot surfaces.
- Coil resistance: With gas off and power disconnected, measure resistance across the gas valve coil terminals. Compare to Peerless or valve manufacturer specs. Replace the gas valve if open or shorted.
- Reset and test: After any wiring repair, restore power and gas and reset the boiler.
- If F4 persists: A technician should verify control board output and replace the gas valve or control as needed.
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Repair Difficulty
Professional Required
5/5
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