You can easily determine that a thermocouple needs replacing if the pilot light refuses to stay lit no matter how long you hold down the control button, or if the pilot repeatedly goes out shortly after ignition. When the thermocouple's internal bimetallic junction degrades, it fails to convert flame heat into the millivolt electrical current required to keep the gas safety valve open. Verification: Test the thermocouple's millivolt output with a multimeter; a reading consistently below 12 millivolts confirms replacement is necessary.
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