I have a Duo-Therm roof top. The compressor wont shut off. When the stat is satisfied the fan stops but not the compressor. I pulled the metal control box but didnt see a real set of contacts. Where are they? I am sure that the contacts are just sticking. It looks like the circut board is ..E2210879. THANKS Jeff

check for the presence of voltage supply to the fan motor,if it has voltage,check the winding of fan motor if it has resistance base on its connections.if the fan is defective,perform a rewinding of coil

Hi, to find out if its your control thermostat, just pull off the cover, and disconnect the wires. It should just right off. If it does, the stat is faulty. If it continues to run, I would go up top and check the contactor to see if the contacts are welded together. This does happen. This way you will know if its the stat, or something else going on. Please keep me posted, and I will get back to you a.s.a.p.
Sincerely,
Shastalaker7
A/C, & Heating contractor.
PS, you will not get shocked by the wires at the stat, very, very low voltage!

Hi,
Sounds like the compressor is toast...if the caps have been changed and there is voltage there, you have done all you can...replace the compressor or buy new...

heatman101

Hi; You still have a loose connection somewhere. I have found just recently a problem with a customer with the same problem He had burnt wiring at the compressor terminals. Also check to see if the fan on top of R.V. is running when the inside fan is running they are connected together on the same motor up top. Also check for a dirty condensor coil this can cause the compressor to fail out on thermal overload...alpharome416

try to change the condensator

maybe the capacitor for fan was already busted try to check that.

find the stat wire and jump red to green to see if fan comes on if so then stat bad if not check for 24v ac transformer or 5 amp fuse

Sounds like a bad thermostat switch, (stuck close--or in run position).

Sounds like 1 of 3. Blower motor capacitor, relay or thermostat. Try to run fan only if that is an option and see.