Have HVAC Questions? Ask an HVAC Expert for Answers
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Does the igntor glow? You should hear the exhaust fan come on and then the ignitor should glow. If the fan is coming on check for power to the ignitor, it was common for them to break on that unit and that may be the cause of the not heat. Let me know what you find.
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In the first pic you will see the two wires going to a white quick connector off the bottom left are under the burner do you see that? That is the ignitor. Check that and see if it looks good with no cracks and I would check it with a ohm meter as well.
Ok does the exhaust fan run when there is a call for heat? Also can you check the board for any flashing error code?
OK there is a rubber tube that runs between the inducer(exhaust blower) housing and the pressure switch, remove the tube from the inducer housing and check the small port where it connects for a blockage, also check the outside exhaust vent for a blockage. Then inspect the rubber tube itself for cracks or holes, one of these is likely causing the issue if the exhaust blower is coming on.
If you remove the rubber tube do you feel some suction from the port when the exhaust fan comes on?
Ok if you go outside is there air coming out of the exhaust vent?
Can you remove the exhaust pipe off the unit just to test it and see if it fires with the exhaust pipe off?If it does then you have a blockage in the pipe, you can not run it with the exhaust pipe off at all, but just to test it briefly.
You would have to get to the exhaust vent, if you get no suction at the port the exhaust is probably blocked. Often a bird will build a nest in the end of the pipe causing that issue.
Just let me know if you need anything else.