Thermador No Power to Compressor / Start Device Failure

Both refrigerator and freezer are warm; compressor not running; no error code.

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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

Tripped house breaker or GFCI, Failed compressor start relay/overload, Loose power cord connection, Defective main control board relay

How to Fix / Troubleshooting

Safety first: Use caution when working near live electrical circuits. Unplug the unit before removing rear panels.

Steps to check:

  • Verify power: Confirm the outlet has power by testing with another appliance. Check the circuit breaker or GFCI.
  • Listen for compressor: After restoring power, listen for humming or clicking from the compressor area. Repeated clicking suggests a start device issue.
  • Inspect start device: Remove the rear panel and check the compressor start relay/overload for burn marks or rattling. Replace with a Thermador-compatible start device if suspect.
  • Check wiring: Ensure all connectors to the compressor and control board are secure.

Note: If the compressor still does not start, the compressor or control board may be defective. This requires professional diagnosis.

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Repair Difficulty

Hard 4/5

Required Part

Compressor Start Relay
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