Sunbeam
Control Logic / Relay Failure
Dehumidifier powers on but compressor and fan never start (unit just sits idle)
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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
Humidity set too high, Faulty humidity sensor reading low, Stuck compressor or fan relay on control board, Defective main control board
How to Fix / Troubleshooting
Safety: Unplug before opening the unit.
Steps:
- Settings check: Lower the desired humidity setting to 30–40% and ensure the unit is not in fan-only mode (if applicable).
- Bucket and float: Confirm the water bucket is fully inserted and the bucket switch is engaged; otherwise the unit will not start.
- Humidity sensor: If the room feels humid but the display shows low humidity, the sensor may be faulty. See the E3 entry for testing and replacement.
- Relay inspection: Access the main control board and listen for relay clicks when the unit is turned on. No clicks may indicate failed relays or control logic.
- Board replacement: If sensors and switches are good but the compressor and fan never receive power, replace the main control board.
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Repair Difficulty
Hard
4/5
Required Part
Main Control Board
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