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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
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.
---------- FOLLOW-UP ----------
QUESTION: If I turn the fan on and not on auto the fan works property though.
Thanks again for your help
Answer
Justin,
You didn't say that the blower worked when the thermostat was set to fan on.
With the new information I have to revise my answer.
Just to confirm, your saying that the blower doesn't work or work properly when the thermostat is set to heat or cool but that it dose work properly when set to fan on?
If that's correct then the problem could be the thermostat, the low voltage wiring in and from the thermostat to the blower relay or the blower relay itself?
To check the thermostat remove the R and W wires from the back of the thermostat to keep from damaging the thermostat and twist them together to see if that helps?
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