Termet Blower Stuck in Fan-On Mode / Fan Relay Fault

Blower runs continuously even when there is no call for heat.

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

Thermostat fan set to ON, Stuck fan relay on Termet control board, Shorted fan control wiring, High-limit thermostat open causing fan overrun

Safety: Turn off power before accessing wiring.

Check thermostat: Ensure the fan setting is AUTO, not ON.
Observe furnace status: If the burner is off and the blower runs indefinitely, the fan relay may be stuck.
Power reset: Turn off power for 5 minutes, then restore. If the blower starts immediately without a heat call, the relay or board is likely faulty.

Fan relay or control board replacement should be performed by a professional.

Medium 3/5

Main Control Board

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