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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My name ***** *****. Heil furnace won't light, showing 2

Customer Question

Hi, my name ***** *****. Heil furnace won't light, showing 2 flash code meaning pressure switch open . install new pressure switch, check vent lines and condensate line all clear, even install new draft motor will not light, keep showing 2 flash code. model# *****
JA: Thanks. Can you give me any more details about your issue?
Customer: jump t-stat furnace won't light, check for 24v to board from tran, 24v from tran good, draft motor come on with call for heat, blower come on for 90 sec then goes off then furnace show normal heart beat for 30 sec. then 2 flash code again
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Submitted: 1 year ago.
Category: HVAC
Expert:  airheatman replied 1 year ago.

Can you verify the pressure switch is indeed closing?

Customer: replied 1 year ago.
Customer: replied 1 year ago.
new pressure switch and draft motor
Customer: replied 1 year ago.
can there be a board issue
Expert:  airheatman replied 1 year ago.

Yes if pressure switch is indeed closing and opening board may be defective not sensing it opening and closing.Do you have a meter to see if switch is opening and closing?