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Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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My furnace comes on and the heaters come in, but when the

Customer Question

my furnace comes on and the heaters come in, but when the blower motor comes in the furnace heaters shuts off
Submitted: 1 year ago.
Category: HVAC
Expert:  Phil replied 1 year ago.


So far it sounds like there might be a crack or hole in the heat exchanger, and when the blower comes on it blows air into the fire box and blows the flames away from the flame sensor.

Watch the burner flames carefully, notice the shape of the flames, how they look, the look for changes when the blower starts... if you see any change, the heat exchanger is bad.

Let me know what you find, we can go from there with no time limit.