Frigidaire Continuous Blower Operation

Furnace blower runs continuously 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, Stuck blower relay on control board, Open limit switch, Miswired thermostat

How to Fix / Troubleshooting

Safety: Turn off power before accessing the control board.

  • 1. Thermostat setting: Check that the fan setting is on AUTO, not ON.
  • 2. Reset power: Turn furnace power off for 5 minutes, then restore. If the blower starts immediately with no call for heat, suspect a stuck relay or open limit.
  • 3. Limit switch check: An open high limit can cause the board to run the fan continuously. Replace a faulty limit switch after confirming airflow is adequate.
  • 4. Board relay: If the limit is closed and thermostat is not calling, the blower relay on the 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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