Schumacher
Cooling Fan Control or Temperature Sensor Drift
Charger fan runs loudly or continuously even when not charging.
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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
Stuck fan relay or transistor on control board, Clogged air vents causing higher internal temperature, Failing temperature sensor reading too high, Fan bearings worn causing noise
How to Fix / Troubleshooting
Safety first: Turn OFF power before cleaning vents or opening the unit.
- Clean vents: Vacuum dust from intake and exhaust grilles. Ensure nothing is blocking airflow around the Schumacher charger.
- Listen to fan: If the fan is grinding or rattling, the bearings are likely worn and the fan should be replaced.
- Check ambient temperature: High garage temperatures can cause the fan to run more often. Improve ventilation if possible.
- If fan runs at full speed constantly in cool conditions: The temperature sensor or fan control circuit on the control board may be faulty. Replace the fan first; if behavior remains, have the control board serviced.
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Repair Difficulty
Medium
3/5
Required Part
Internal Cooling Fan
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