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Thermador Oven Won't Turn Off

The part(s) or condition(s) listed below for the symptom Oven won't turn off 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 won't turn off

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Cause 1Touchpad and Control Panel

If the oven won't turn off, it's possible that the touchpad has shorted or is malfunctioning in some other way. To help determine this, shut off the power to the appliance to allow it to cool down and disconnect the touchpad ribbon from the control board. Restore power to the unit and observe whether or not the oven turns on with the touchpad ribbon disconnected. If the oven does not turn on, it's likely the touchpad is the source of the problem and the component will need to be replaced.

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Cause 2Touchpad

If the oven won't turn off, you should unplug the power cord or shut off the power supply and let the oven cool down. Disconnect the touchpad ribbon from the control board and restore power to the oven. If the oven does not start to heat back up with the touchpad ribbon disconnected, the touchpad is likely defective and will need to be replaced.

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Cause 3Temperature Control Thermostat

The temperature control thermostat monitors the temperature inside the oven and cycles on the heat when the oven temperature gets too low. If the temperature control thermostat fails, the oven won’t heat. However, this is not very common. Before replacing the oven thermostat, first check more commonly defective components—specifically the igniter and the bake and broil elements. If these components are not defective, the temperature control thermostat might be at fault. The temperature control thermostat cannot easily be tested. If you suspect the thermostat is defective, replace it.

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Cause 4Oven Control Board

The oven control board has relays that send voltage to the bake and broil circuits according to the user settings and sensor input. If one of the control board relays shorts closed, the control board may send continuous voltage to the heating circuit. If the oven continues to heat after it is turned off, the control board is likely defective. If the control board is defective, replace it.

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Cause 5Bake Element

Sometimes, if the heating element burns out, it can short out to the inside of the oven. If the heating element has shorted out, the oven will not turn off. Often, if the bake element has shorted out, it will be visibly damaged. Inspect the heating element for holes or blisters. To determine if the bake element has shorted out, use a multimeter to test the element for continuity. If the bake element does not have continuity, replace it.

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Cause 6Broil Element

If the broil element is shorted out, the oven may not turn off. Often, if the element has shorted out, it will be visibly damaged. Inspect the broil element for holes or blisters. To determine if the broil element is shorted out, use a multimeter to test the element for continuity. If the broil element shows continuity from the terminals to the outer case, this indicates that it is shorted out. If the broil element is shorted out, replace it.

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Cause 7Control Board

The control board has relays that send voltage to the bake and broil circuits according to the user settings and sensor input. If one of the control board relays shorts closed, the control board may send continuous voltage to the heating circuit. If the oven continues to heat after it is turned off, the control board is likely defective. If the control board is defective, replace it.

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Cause 8Relay Board

Some ovens are equipped with a relay board. The relay board has several relays which control the voltage to the heating element. If one or more of these relays fails, the relay board might send continuous voltage to the heating element. If the relay board is defective, replace it.

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