Thermador Oven Light Is Out – How to fix? by HoustonAuthorizedRepair.com 

The part(s) or condition(s) listed below for the symptom Oven light is out are ordered from most likely to least likely to occur. Check or test each item, starting with the items at the top of the page.

Most Frequent Causes for Oven Light Is Out

Cause 1 Light Assembly Cause 2 Light Bulb Cause 3 Light Socket
If the oven light is out, the entire light assembly may need to be replaced. Often the light assembly components are not sold separately. To determine if the light bulb has burned out, use a multimeter to test it for continuity, or install the bulb into an identical socket to test it. Use a multimeter to test for power to the light socket. If the light socket is getting power, but the oven light won’t work, this indicates that the light socket is defective. If the light socket is defective, replace it.
Cause 4 Light Switch Cause 5 Touchpad and Control Panel Cause 6 Touchpad
To determine if the light switch is defective, use a multimeter to test it for continuity. If the light switch does not have continuity, replace it. The touchpad and control panel regulate the power supply to all of the oven components, including the oven light. If the touchpad and control panel assembly is defective, it won’t signal the oven control board to turn on the oven light. However, this is rarely the case. First, test the light bulb and socket. If the light bulb and socket are not defective, the touchpad and control panel assembly might be at fault. The touchpad has a button that controls the oven light. If this button is defective, the touchpad won’t signal the oven control board to turn on the oven light. However, this is rarely the case. First test the light bulb, socket, and switch. If none of these components is defective, the touchpad might be at fault.
Cause 7 Transformer
The transformer might be defective. However, this is rarely the case. First check the light bulb, socket, and light switch. If none of these components is defective, the transformer might be at fault. The transformer is not repairable—if the transformer is defective, you must replace it.
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