State Control Board / Gas Valve Internal Error

State electronic gas tank-type water heater LED flashes E4; unit may not respond to commands.

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.

Possible Causes

Internal electronics failure, Moisture intrusion into control, Power surge damage

Safety: Turn gas control to OFF and disconnect power if applicable.

Inspect control: Look for signs of water leaks above the gas control. Repair any leaks before replacing components.
Drying: If minor condensation is present, allow the area to dry completely and try again. Do not use open flame to dry.
Replace control: Persistent E4 typically requires replacement of the gas control valve/thermostat with the correct State part.

Hard 4/5

Gas Control Valve / Thermostat

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