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How do I troubleshoot Ge Wall Oven that is displaying F3 or F4 error code?

The oven's electrical power supply needs to be disconnected. Measure the oven temperature sensor resistance. The oven temperature sensor needs to be replaced if the resistance isn't high. If the oven temperature sensor wire harness is damaged, it's time to replace it. The electronic oven control board should be replaced if the temperature sensor and wire harness are ok.

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