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How do I troubleshoot Thermador Masterpiece Wall Oven that has a Upper Oven that has a Cooling Fan that is failed?

Check the wire harness connections on the upper oven cooling fan and the upper oven cooling fan hall sensor, as well as the electrical power to the oven. Attach loose wires or replace damaged wire harnesses. If the upper oven cooling fan doesn't work, you should replace it. The cooling fan hall sensor needs to be replaced if it is malfunctioning.

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