I have a Coleman furnace/ac inside unit in a mobile home, that works fine, but will not shut off by itself. The thermostat was tested and is fine. We have had 2 repairmen out to look at it and they can't seem to fix the problem. The relay was replaced and the outside unit (Carrier) was cleaned. Please help!!!!!
A/C only will not shut off would check for low refrigerant charge. If furnace also will not shut off (remember fan will run for short time before shutting down) then either thermostat is wired wrong or control board is defective
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Your unit uses both the capacitor and a contactor (relay) to start your compressor and motor. With the indications you are giving it would either be the capacitor or the contactor - and since you have already changed the cap - then replace the contractor!
NOTE: We always recommend that you change the capacitor and relay at the same time, because they seem to fail at about the same time.
There is a fan cycle switch that turns on the fan when the unit heats up (so it won't be blowing cold air) and runs the fan after the unit has shut off to remove heat from the unit. Sounds like it bit the dust. It is located next to the firebox.
The filter is located before the blower if your Coleman is in a mobile home it will be in the door facing. If it is a standard ac/heat application and a regular residential furnace the blower in the cabinet on down flow (ducts in floor) will be above it and possible in the duct connecting in the top. If its the other way (ducts in ceiling) it could be right under the blower. Either of these could have a filter cabinet on the furnace or could have a filter grille at the end of the return air duct (where the air is sucked in).
there is a "control unit" inside the bottom cover of the A/C on your cealing ... inside there is the control box that controls itself. Has a silver peice bout 2'' thick and the size of a quarter this is your freeze control, if your A/C gets TOO cold and might damage itself it kicks on and shuts down your unit(yes even your furnace) need to have a tech come out and fix/replace it, RV Tech, most A/C repair companies know NOTHING about RV's
put the just the fan on turn off the ac and the heat and just fan on make sure the blower motor works cause thats really the only thing you utilize from the furnace in the summer and let me know
then if so does your heat work fine