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How do I troubleshoot Ge Combination Wall Oven And Microwave that is displaying F30 or F31 error code?

Check the wire harness connections between the oven temperature sensor and the electronic oven control board after you disconnected electrical power to the oven. If the wire harness is damaged, replace it. Measure the oven temperature sensor resistance using a multimeter if the wire connections are okay. You should measure the resistance at room temperature. The oven temperature sensor should be replaced if the resistance is off.

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