Hi gurus... I have a Buck Stove gas stove that is a few years old. I recently switched thermostats to a wireless version. The stove worked fine this winter...until yesterday. Now, the main flame will not go out unless I turn the control knob on the stove to pilot. I've checked the thermostat and receiver, they are communicating. The batteries are new in both. The signal from the thermostat makes it to where the wires terminate. After turning the knob to pilot, if I turn it back to on, the stove lights right away. It's like the valve that the thermostat should shut down is stuck open. Am I on the right track? What is this valve called? Any other ideas on what might cause this problem?