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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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Have a furnace not starting combuster fan motor on turns on

Customer Question

have a furnace not starting combuster fan motor on turns on for quick second
Submitted: 9 months ago.
Category: HVAC
Expert:  Rick replied 9 months ago.

Welcome to Just Answer, my name is ***** ***** I will do my best to help you with your

issue. First I’ll need some more info so I have a more complete picture of you situation.

What is the brand and model number of your furnace?

Customer: replied 9 months ago.
Lennox model g40uh-24a-045
Customer: replied 9 months ago.
made for fan was good by giving 120 from transform
Expert:  Rick replied 9 months ago.

Ok, what is the flash sequence on the LED's on the control board?

Customer: replied 9 months ago.
cant remember blower comes on within one minute read something about prove switch
Expert:  Rick replied 9 months ago.

Please answer my last question. What are the LED's on the board doing?

Customer: replied 9 months ago.
flashing two times
Expert:  Rick replied 9 months ago.

There are 2 LED's are they both flashing? only 1? which one? flashing fast or slow?

Customer: replied 9 months ago.
not at unit
Customer: replied 9 months ago.
never mind i will try back later getting no answers must call in front of unit is there a number i can call once there
Expert:  Rick replied 9 months ago.

You can't troubleshoot this unless you're there. All I can do now is tell you if you have constant 120 v to the draft fan and it isn't running you either have a bad connection or a bad fan

Expert:  Rick replied 9 months ago.

I'm online until ~ 7 pm EST. I do take breaks. I'll respond as soon as I can

Customer: replied 9 months ago.
fan runs with direct 120
Expert:  Rick replied 9 months ago.

Ok, get back to me when you're onsite with a multi-meter.