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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My Heil gas furnace flashes thee times (the light)

Customer Question

my Heil gas furnace flashes thee times (the green light)
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.

Look on the the wiring diagram glued inside the blower service door for the error code read out, or possibly on a sticker next to it, however on that model the 3 flash error code is for a defective pressure switch or some other situation thats resulting in the inducer fan not able to pull a low enough pressure on the combustion chamber.

Tell me about how old your furnace is, and if it has metal or plastic vents attached, and a lot about your technical skill sets so that I can coach you most effectively from here.

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