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About Jim Barnhart
Expertise
Fifty + years in Heating, Ventilating, Air Conditioning, Sheet Metal Manufacturing.
Semi retired since 1995,
Experience
Answer questions about , residential and commercial.
Answer questions about sheet metal fabrication.
Fifty years plus experience.
No answers for oil equipment, No answers for kitchen appliances, No answers for laundry appliances.
Education/Credentials
Hands on since 1950
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You are here: Experts > Home/Garden > Home Appliances > Heating, Air Conditioning, Fridge, HVAC > igniter issue
Expert: Jim Barnhart - 11/4/2009
Question
We have a 1988 vintage Carrier Plus 90 condensing furnace.
There has been on ongoing problem with the igniter system.
The pilot light always lights but the main burner only lights in about 1 out of 3 or 4 cycles. The system must think that the pilot is not lit when the main burner does not light, even though the pilot is always lit.
I have replaced the electrode, the pilot burner assembly and the control circuit board. Nothing helps.
I tried bending the wire at the end of the electrode in an attempt to get it more into the pilot flame and that caused the system to just spark and then close the gas to the pilot. I then put in another electrode with the factory angle unchanged.
I have installed a new orifice in the pilot burner.
The pilot flame seems to dance around. Could the air flow be too turbulent and cause the system to not sense enough heat from the pilot on the electrode and conclude that the pilot is not lit?
THANKS for any help that you might offer.
Answer
Bob,
The pilot dose need to engulf the electrode element with a steady non wavering flame.
Make sure all the covers are on in place at the burner access so there is no draft,
I don't know what's causing the pilot flame to dance,I assume the line is clean, you may want to try enlarging the pilot orifice opening a tiny, tiny bit?
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