UK Appliance Repair Questions? Ask a Technician for Answers ASAP
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If it is off by 75* F and the sensor and the control are new, the issue is likely to be with the wiring between the two. Do you have a meter to test resistance with?
The sensor circuit works by the sensor sending a resistance signal to the control which changes with the temperature. So, if a connection is bad or a wiring harness has been pinched or otherwise damaged, it will increase the resistance of that circuit, making the control see a different measurement than what the sensor is sending.