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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 > coleman evcon furnace
Expert: Jim Barnhart - 11/5/2009
Question
I have a coleman evacon furnace/ac unit.
The a/c worked fine this summer the main fan turns on and off when it is supposed to. This winter the hvac unit will fire and the low speed fan will run but the main fan will not turn on. I have had circuit board replaced and a thermal limit switch replaced the code that is being set is differant. it has been primairy limit switch open circuit and pressure switch normaly closed ciruit open code. I checked the pressure switch with an dvom and it reads 160 ohms when the furnace is on.
when it doesnt turn on if i shut power off to it via the circuit breaker and turn it back on the unit will run normally but will intermmintely not restart.
Thanks for any help i am starting to pull my hair out over this thing.
thanks again
Justin
Answer
Justin,
I'm not sure what your calling "the low speed fan"? Could it be the induced vent draft blower?
If the vent fan starts and runs,and if the igniter glows and lights the burner then there is nothing wrong with the pressure switch.
I think you have a faulty blower motor or a faulty blower motor capacitor.
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