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My furnace comes on and the heaters come in, but when the…

Customer Question
my furnace comes on and...
my furnace comes on and the heaters come in, but when the blower motor comes in the furnace heaters shuts off
Submitted: 2 years ago.Category: HVAC
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Answered in 17 minutes by:
10/18/2015
HVAC Technician: Phil, Mechanical Engineer replied 2 years ago
Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 7,426
Experience: Retired HVAC/ Electrical & Boiler contractor. Industrial
Verified

Hello,

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.

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