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Phil
Phil, Mechanical Engineer
Category: HVAC
Satisfied Customers: 6022
Experience:  Retired HVAC/ Electrical & Boiler contractor. Industrial
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I have a air fli furnace that has a flame failure lockout

Customer Question

I have a air fli furnace that has a flame failure lockout what do I do
Submitted: 1 year ago.
Category: HVAC
Expert:  Tim H. replied 1 year ago.

Hi, I'm Tim and I'm an HVAC expert here to assist you with your questions. Please provide all information I request as it makes it more difficult to troubleshoot something when I'm not there onsite. Essentially, you become my eyes and ears. Thanks for the opportunity to help. At the end of our dialog, you will have a chance to rate my service, but please wait until we are finished and you're satisfied you have all the information you need.

Are the burners lighting at all, even if only briefly?

Customer: replied 1 year ago.
Sometimes. The surface igniter glows gas valve clicks but won't light ther is gas pressure
Expert:  Tim H. replied 1 year ago.

have you tried cleaning flame sensor?

Customer: replied 1 year ago.
Flame not coming on to reach sensor all limit switches check ok. New valve and control board
Expert:  Tim H. replied 1 year ago.

Are you getting 24 volts to the valve after the ignitor lights up?

Customer: replied 1 year ago.
Expert:  Tim H. replied 1 year ago.

What kind of pressure is coming out of valve in inches water column?

Customer: replied 1 year ago.
That I didn't check the other furnace nex to it works fine. Could the orifices be plugged
Expert:  Tim H. replied 1 year ago.

We should be getting 3.5 inches water column on outlet side of valve when valve gets 24 volts. Yes, it's possible orifices could be plugged.

Customer: replied 1 year ago.
Both furnaces r on the sme bs line
Expert:  Tim H. replied 1 year ago.

If the pressure is low, this would prevent it from lighting.

Expert:  Tim H. replied 1 year ago.

We can't assume anything. Just because the one next to it works, doesn't mean there might not be a problem with this furnace.

Customer: replied 1 year ago.
I turned the other one off after it was running same results with the one I'm having trouble with
Expert:  Tim H. replied 1 year ago.

If the valve has 24 volts (and it's good), there should be a certain pressure from the outlet side of gas vlave (3.5 inches WC)

Expert:  Tim H. replied 1 year ago.

If you can get me that reading, we can go from there.

Customer: replied 1 year ago.
Ok I will check tomorrow thanks
Expert:  Tim H. replied 1 year ago.

Thanks

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