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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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No fault codes. Furnace won't light. Ran through test by

Customer Question

No fault codes.
Furnace won't light.
Ran through test by jumping test terminal with common and I get the following:
Draft inducer comes on, igniter glows, main blower comes on, then speeds up.
When thermostat is demanding heat draft inducer comes on for about 12 -15 seconds, but no ignitor then the process repeats
Submitted: 1 year ago.
Category: HVAC
Expert:  HVAC Guru replied 1 year ago.

Hello and thanks for using this service, if you have been waiting do not worry or get upset I am just one of the techs on here and I try to get to as many customers as I can and I just picked up your question now.

You have replaced the main board and it does the same thing?

Customer: replied 1 year ago.
it does the same exact thing.
Expert:  HVAC Guru replied 1 year ago.

Is the wiring good from the pressure switch to the board and have you checked all your grounding wires? Lastly do you get any power to the ignitor when the inducer comes on checking it with a meter?

Customer: replied 1 year ago.
I found and fixed the problem. It was the thermostat.Your assistance is not required.
Expert:  HVAC Guru replied 1 year ago.

ok no problem