Have HVAC Questions? Ask an HVAC Expert for Answers
Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.
What happens at the furnace with a call for heat? Have you tried bypassing the thermostat to see if this makes a difference?
OK, so you bypassed the thermostat and it still doesn't work? What is the full model number of the furnace? Are you getting any LED flash code? What happens on a call for heat? Does the inducer motor start?
If you are getting no LED flash codes, get a voltmeter and set to volts AC. Test across C or COM to R at the control board with blower door switch pushed in. You should read 24 volts.
I need more information here to proceed. A full model number will help me in case I need to pull up a wiring diagram.
Otherwise, I'd just be guessing and I'm sure you don't want that. We can work through to a solution, but since I'm not there onsite, I need you to be my "eyes and ears". The question will remain open, so later is fine