Have HVAC Questions? Ask an HVAC Expert for Answers
Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your issue. If my initial response doesn’t answer your question then let me know and we can continue our conversation.
Your description would seem to point to the thermostat. The next time this happens you could try bypassing the thermostat by connecting the leads on the R & W terminals together. If the furnace fires right up then that would point to your thermostat. There are other possibilities but you need to rule out the thermostat first. When you connect the 2 leads at the thermostat take care to not touch them to any other leads/terminals on the thermostat.
You're welcome. I mean the wires connected to the R & W terminals on the thermostat. It's usually red & white but not always