Heil
Blower Stuck On
The indoor blower runs continuously even when the thermostat is not calling for heat or fan.
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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
Fan set to ON at the thermostat, Stuck blower relay on the control board, Open limit switch causing fan-only mode, Shorted G (fan) thermostat wire to R
How to Fix / Troubleshooting
Safety: Turn off power before accessing the control board or wiring.
Steps to check:
- Thermostat fan setting: Ensure the fan is set to AUTO, not ON.
- Check thermostat wiring: At the furnace board, disconnect the G wire. Restore power. If the blower stops, the thermostat or wiring is calling for the fan.
- Inspect limit switch: If the main limit is open, many Heil furnaces will run the blower continuously. Check for an error code indicating an open limit and correct overheating causes.
- Control board relay: If the blower runs with G disconnected and no limit fault, the blower relay on the board may be stuck closed.
When to call a pro: A technician should replace the control board if the blower relay is welded, and verify limit circuit operation.
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Repair Difficulty
Medium
3/5
Required Part
Furnace Control Board
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