E7
Trotec
Compressor Start Failure / Current Protection
Dehumidifier shows E7 and stops; may occur when trying to start compressor.
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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
Failed compressor start relay or PTC, Shorted compressor winding, Faulty main PCB power relay, Undersized or unstable mains voltage
How to Fix / Troubleshooting
Safety: Unplug the unit. High voltage is present around the compressor and power board; if you are not experienced with electrical work, contact a technician.
Steps:
- Check mains supply: Ensure the unit is connected to a properly grounded outlet with the correct voltage specified on the rating plate. Avoid extension cords.
- Listen for compressor: When the unit tries to start, listen for a brief hum followed by a click. Repeated clicking without running suggests start component issues.
- Inspect start components: Access the compressor terminal cover. Check the start relay/PTC and overload protector for burn marks or loose connections.
- Test compressor windings: With power disconnected, remove the relay and measure resistance between compressor terminals (C-R, C-S, R-S). Infinite or zero readings indicate a bad compressor.
- Replace start relay/PTC: If the compressor windings test OK, replace the start relay/PTC with a compatible Trotec part.
- PCB relay check: If the compressor never receives power, the main PCB relay may be faulty and require board replacement.
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Repair Difficulty
Professional Required
5/5
Required Part
Compressor Start Relay/PTC
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