E0
State
Gas Control Valve / Thermostat Failure
State electronic gas tank-type water heater LED flashes E0 or similar code; unit will not light.
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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
Internal failure of electronic gas control, Power surge damage, Faulty temperature sensor inside control
How to Fix / Troubleshooting
Safety: Turn gas control knob to OFF and shut off gas at the manual valve. Disconnect power if equipped with a cord.
- Power cycle: Wait 5 minutes, then restore power and attempt to relight following the lighting instructions. If E0 returns immediately, the control is likely defective.
- Check wiring: Inspect the harness between the gas control and any sensors (e.g., FV sensor, ECO). Reseat connectors.
- Replace control: If the code persists, replace the gas control valve/thermostat with the exact State replacement part. This involves draining the tank below the control level, removing the old control, applying approved pipe sealant, and reinstalling per the manual. Leak-test all gas connections.
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Repair Difficulty
Hard
4/5
Required Part
Gas Control Valve / Thermostat
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