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Duo-Therm Compressors will not shut down. In "off" or "furnace" the compressor keeps running. Either compressor will shut down when the 12vdc fuse is pulled. Fans on both work ok in both speeds. I

Both fore and aft thermostats have "furnace" wires connected, which I don't understand. I would love to try a Hunter thermostat, but I'm not positive the thermostats (both?) are the problem, and I haven't seen any traffic online about the Hunter in a 2-zone setup. I know the compressors are zone controlled by the dip switches in the analog control boxes, so maybe dual Hunters would work. Any ideas?

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  • Dometic Master
  • 6,674 Answers

What about one for cool only, and one for heat/cool ?

Posted on Jan 27, 2013

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Posted on Jan 02, 2017

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  • 230 Answers

SOURCE: will not shut off

Sounds like a stuck relay on the unit itself. Maybe there is a short in the control wire that comes from the thermostat that activates the fan.

The thermostat probably has one hot wire at all times. The thermostat then chooses which wire to send the voltage down based on your selection. One of those wires is probably for the fan only. Make sure that it is in good condition (no bare, pinched or wires)

Posted on Jun 17, 2008

motor1258
  • 6674 Answers

SOURCE: duo therm air conditionning/furnace thermostat in RV

Checked all breakers & fuses in panel ?

Posted on Aug 14, 2008

motor1258
  • 6674 Answers

SOURCE: dometic air & analog thermostat control kit

Had one doing similar recently, and after a thunder & lightning storm. Nothing worked, but kept blowing 2 amp fuse in thermostat, when anything tried, heat or cool. Pulled plastic control box down from inside upper unit (AC) made sure breaker was off, took of plastic cover and smelled inside, and could smell burnt plastic smell. Replaced, control box, that got fan only working. Tried another thermostat , everything worked as it should. Turns out the lightning, or power surge, or whatever, shorted out the thermostat, and control box at same time.

Posted on Aug 14, 2008

  • 659 Answers

SOURCE: Duo Therm compressor tries to start and kicks out

I don't think these little units have a start capacitor but what I would do is check that the on/off switch wires to make sure they aren't loose. Also check the wires to the compressor for loose wires as well. It is possible that these are the first signs that the compressor is about to fail. They also can act up some when they haven't been used for awhile and then you try and start them up. Try running the unit for a few hours without asking it to cycle. It might just be a sticky valve.

Posted on Apr 13, 2009

  • 233 Answers

SOURCE: a/c compressor runs, no fan

did you ohm the relays to verify a correct path? It sounds like the relay contacts are not "making" and providing a pth for flow.

Posted on Jul 12, 2009

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