I have an hvac system with a natural gas furnace. For some reason now the heat won't shut off. The temperature rises above the set temp and it still heats. I switch the thermostat to off, and it would still blow hot air. In order to stop the heating I have to switch off the breaker to the furnace. Is it likely that the thermostat is bad? The screen on the thermostat is on and the display looks good... it just can't get the system to shut off.
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