Kelvinator
Continuous Fan Operation
Furnace blower runs constantly even when thermostat is not calling for heat
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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
Thermostat fan set to ON instead of AUTO, Stuck blower relay on control board, High limit switch open causing fan-only mode, Miswired G terminal
How to Fix / Troubleshooting
Safety first: Turn OFF power before working inside the furnace.
- Thermostat setting: Check that the fan mode is set to AUTO, not ON. This is the most common cause.
- Check high limit: If the furnace recently overheated, the control board may be running the fan to cool the heat exchanger. Replace a clogged filter and allow the furnace to cool.
- Inspect wiring: Verify that the G wire from the thermostat is correctly connected and not shorted to R at the furnace control board.
- Board relay: If the blower runs even with the thermostat disconnected, the blower relay on the Kelvinator control board may be stuck closed and the board will need replacement.
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Repair Difficulty
Medium
3/5
Required Part
Integrated Furnace Control Board
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