Trane
Blower Stuck in Continuous Operation
Furnace blower runs continuously even when 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
Thermostat fan set to ON, Stuck blower relay on control board, High limit switch open, Miswired G terminal
How to Fix / Troubleshooting
Steps to check:
- Thermostat setting: Ensure the fan mode is set to AUTO, not ON.
- Check for fault codes: Look at the Trane control board LED. An open high limit can cause continuous blower operation.
- Power cycle: Turn off power for 30 seconds and restore. If blower starts immediately without a call, the relay or board may be stuck.
When to call a professional: If the blower relay on the board is stuck or the high limit is open, a technician should replace the control board or diagnose the cause of overheating.
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Repair Difficulty
Medium
3/5
Required Part
Integrated Furnace Control Board
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