American Water Heaters Blower Stuck On / Control Relay Stuck

Water heater fan or blower runs continuously even when there is no hot water demand.

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

Stuck blower relay on control board, Miswired thermostat or call-for-heat signal, Control board logic fault

Safety: Turn off power before inspecting controls.

1. Power reset: Turn off power for several minutes, then restore and observe if blower stops running continuously.
2. Check call-for-heat inputs: Ensure there is no external control or recirculation system falsely signaling demand.
3. Replace control: If blower continues to run with no demand and wiring is correct, replace the gas control valve/control board assembly.

Hard 4/5

Gas Control Valve / Electronic Control Assembly

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