If your Thermador refrigerator light not working, start with the parts that actually supply power: the light switch, the door switch, and the light socket are the most common failures and should be tested first for continuity with a multimeter. Next, replace the light bulb — bulbs fail more often than the electronics, so change it before buying other parts. If the bulb and socket check out but the lamp still won’t come on, the light assembly itself can be defective; note some manufacturers only sell the complete assembly rather than individual components. A faulty dispenser control board is possible but far less likely; inspect the board for burn marks and use a meter to see if it is sending voltage to the dispenser lamp connector. Whether you see fridge light not working, refrigerator interior light not working, or a refrigerator light out, RepairClinic has the parts and diagnostics to help — enter your model number on RepairClinic.com to find the exact replacement part for your refrigerator.
01 - Thermador Refrigerator Light Assembly
The light assembly might be defective. Some manufacturers don’t sell the light assembly components separately, and instead require you to purchase the light assembly.
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03 - Thermador Refrigerator Dispenser Control Board
While it's not a likely cause, a defective dispenser control board could be responsible for a dispenser light not working. You can inspect the board for signs of burning or a shorted-out component. You can also use a multimeter to determine if the board is sending voltage to the dispenser light's plug-in connecter. If no voltage is present, you'll know the board is defective and will need to be replaced.
To determine if the door switch is defective, use a multimeter to test it for continuity. If the door switch does not have continuity when activated, replace it.
To determine if the light socket is defective, use a multimeter to determine if the socket is getting power. If the socket is getting power, but the light bulb won’t work, this indicates that the light socket is defective. If the light socket is defective, replace it.