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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 5648
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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It's my combustion air switch thingy...3 flashing lights.

Customer Question's my combustion air switch thingy...3 flashing lights. the chart on the furnace indicates the valve is stuck. HELLLP! It's cold! : )
JA: Did you double-check the thermostat's settings? And what about the filters?
Customer: Yep. changed the filters this very evening and the thermostat's dandy. had this same issue last year & a guy came out & I think replaced the combustion switch..or whatever the thing that's stuck open or closed...or!
JA: Do you plan on doing the work yourself?
Customer: Unfortunately yes...Hah!
JA: Anything else we should know to help you best?
Customer: may help you to know that I'm pretty handy (for a girl!) but furnaces flummox me!
Submitted: 13 days ago.
Category: HVAC
Expert:  Rick replied 13 days ago.

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