I have a Coleman 3300-9051 electric furnace w/AC. The blower continually runs.
Where do I find a repair manual and/or what could be the problem. How do I test it.
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Couple possibilities I can think of:
Thermal switch in the furnace is broken, making it appear to be too hot, and the blower is running to cool it off.
Thermostat has the fan switch set to "on" instead of "auto"
Check the thermostat before trying to work on the furnace itself.
Probably just a stuck relay. Happened to me on my HVAC blower motor this Summer.
There will most likely be a main control board for the furnace and the relay is probably there. As far as testing, you'd have to remove it and supply the voltage that the furnace does, to the right pins, while testing the other pins for continuity/disconnect. You'd need info specific to your furnace/relay to do that (as well as knowing and following the appropriate electrical safety rules) I wouldn't just replace it without testing as they can cost $35+.