The thermocouple is not functioning. The t/c is the small (sensor) tube that the flame touches and should have a small copper tube (capillary) extending to the gas valve. (IMPORTANT: The capillary tube should not have any kinks or crimped places...Only gentle bends. A crimped tube will require t/c replacement.) The flame will deposit a coating (minerals) that will insulate the t/c and prevent it from working. Clean the sensor with steel wool, fine sand paper (emery board) or scotch pad. Now try to relight the pilot making sure the t/c sensor is contacted by the flame, if not, shut off gas and adjust. Once aligned and contacted by pilot flame, hold for a minute, allowing the t/c to warm up fully and signal the gas valve to operate when knob is turned from pilot to operate.
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The thermocouple is not functioning. The t/c is the small (sensor) tube that the flame touches and should have a small copper tube (capillary) extending to the gas valve. (IMPORTANT: The capillary tube should not have any kinks or crimped places...Only gentle bends. A crimped tube will require t/c replacement.) The flame will deposit a coating (minerals) that will insulate the t/c and prevent it from working. Clean the sensor with steel wool, fine sand paper (emery board) or scotch pad. Now try to relight the pilot making sure the t/c sensor is contacted by the flame, if not, shut off gas and adjust. Once aligned and contacted by pilot flame, hold for a minute, allowing the t/c to warm up fully and signal the gas valve to operate when knob is turned from pilot to operate.