10 FLASHES
York
Gas Valve Circuit Error
York furnace shows 10 flashes and will not run; blower may run intermittently.
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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
Gas valve coil open or shorted, Loose gas valve wiring harness, Faulty control board gas valve relay, Incorrect gas valve replacement
How to Fix / Troubleshooting
Safety: Turn off gas and power before touching the gas valve. Gas work should generally be done by a licensed professional.
- Inspect wiring: Remove the burner door and locate the gas valve. Check the 2- or 3-wire harness for loose plugs, corrosion, or damaged insulation. Reseat connectors firmly.
- Visual check of valve: Confirm the valve is a York-approved replacement with correct model and gas type (natural or LP). Incorrect valves can cause control errors.
- Reset and test: Restore power and call for heat. Listen for the gas valve click after the ignitor glows. If there is no click and the 10-flash persists, the valve coil or board relay may be bad.
- Professional testing: A technician can measure coil resistance and verify 24V output from the board to the valve. Replacement of the gas valve or board should be done with proper leak testing and combustion analysis.
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Repair Difficulty
Professional Required
5/5
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