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.All the thermostat does is call in the furnace. If the furnace responds it's not a problem with the furnace. If you want to troubleshoot the furnace I need the furnace model and I need to know what happens when the furnace comes on.
Do you mean the draft fan starts? but it never fires up?
That's not how it works. The draft fan has to establish adequate draft. Once it does the draft switch has to close proving adequate draft then the igniter initializes and then the burners fire up. Once the burners fire up only then does the blower come on
I would expect it to run great after being serviced. I'd suggest you call the service company back and have them check this out. This shouldn't happen right after being serviced.