American Standard
Blower or Fan Control Issue
American Standard air conditioner fan runs but stops and starts repeatedly without thermostat changes
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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
Overheating blower motor, Faulty fan relay on control board, Loose low-voltage connections, ECM motor internal fault
How to Fix / Troubleshooting
Safety first: Turn off power to the indoor unit before inspecting the blower and control board.
- Check motor temperature: After the fan stops, carefully touch the blower motor housing. If it is extremely hot, the motor may be overheating and tripping its internal protector.
- Inspect wiring: Ensure all motor harness connectors and control board terminals are tight.
- Clean blower and filter: Reduce motor load by installing a clean filter and cleaning the blower wheel.
- Professional diagnosis: If cycling continues, a technician should test the motor and fan relay outputs on the American Standard control board.
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Repair Difficulty
Medium
3/5
Required Part
ECM Blower Motor
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