Thermador Refrigerator: Won't Start or Turn On
Commonly a bad start relay or capacitor, a temperature-control fault, or a compressor issue. Add a photo of your Thermador Refrigerator in the box below: the Triage Profile says what it is, how urgent it is, and who to call.
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In the next five minutes
Safe first steps, before the call. Nothing here needs a tool.
Switch off the fridge’s breaker, and don’t touch the plug or cord.
Take a photo of the fridge and any code on the display, without opening anything.
Don’t use it again until it’s checked; keep the doors shut to hold the cold.
Everything else about this problem
Is it an emergency?
Is a Thermador refrigerator that won't start an emergency?
Usually not, but it can be. Because this can be an emergency, leave it off and get it checked; don't reset it or turn it back on. Stop and call a pro if it keeps tripping the breaker or smells like burning.
Symptoms & causes
The Thermador refrigerator appears completely dead, with no lights, fan, or compressor activity, indicating a complete power failure. This often stems from issues with the power supply, a tripped circuit breaker, a faulty outlet, or internal electrical components like the main control board or power cord. Sometimes, even if the display is off, a faint hum might indicate a compressor trying to start but failing due to a bad start relay or capacitor.
Tools & parts
You'll need a multimeter to test voltage and continuity, along with basic screwdrivers (Phillips and flathead). Specific Thermador parts that might be needed include a new main control board, a start relay, or a power cord. A non-contact voltage tester is also highly recommended for safely checking live circuits.
Safety first
Always disconnect the Thermador refrigerator from its power source by unplugging it or shutting off the dedicated circuit breaker before performing any inspection or repair. Be aware of potential electrical shock hazards, especially when dealing with the main control board or compressor components, as capacitors can retain a charge even after power is off. Wear insulated gloves and use insulated tools to minimize risk, and never work on live circuits unless absolutely necessary for testing with proper precautions.
When to call a pro
If the main control board shows no signs of life after verifying power to the outlet, or if there are visible burn marks, a professional Thermador technician is required for testing and replacement. Complex compressor issues, such as a seized compressor or a shorted winding, demand specialized tools and expertise for safe repair or replacement, which is beyond typical DIY scope. Refrigerant system leaks or blockages, indicated by the refrigerator running but not cooling, also necessitate a certified technician due to environmental regulations and specialized equipment.
Questions people ask
What's the first thing to check if my Thermador refrigerator won't turn on?
First, verify the refrigerator is plugged into a working outlet and that the circuit breaker hasn't tripped. Try plugging another appliance into the same outlet to confirm it has power.
Could a power surge cause my Thermador refrigerator to stop working?
Yes, a power surge can damage sensitive electronic components like the main control board or power supply board. These components might need replacement if they were affected by a surge.
How do I know if the main control board is the problem?
If you've confirmed power to the outlet and the power cord is good, but there's no display, lights, or compressor activity, the main control board is a strong suspect. A multimeter can confirm if power is reaching the board but not being distributed.
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What it is, how urgent, who to call
Add a photo of your Thermador Refrigerator in the box at the top. The Triage Profile says what it is, how urgent it is, and who to call.