Question about Dometic Rooftop RV Air Conditioner

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We have a dometic duotherm ac/heat in our 2006 Cougar rv. We were using the air and everything was fine so before I left I used the remote to shut unit off when I went back out the following week-end the unit will not turn on even manually. we figure its got to be the reciever? If so can we order it directly from use?

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  • Dometic Master
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Possible bad motor

Posted on Nov 14, 2017

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Posted on Jan 02, 2017

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Anonymous

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SOURCE: furnace won't turn on, off, with or without remote

We hotwired the thermostat wires and the furnace started. That told us that the problem was with the thermostat. We took our remote control to another camper like ours and our remote worked their furnace. That told us that the problem was in the ceiling control for the furnace/ac. But the man who owned the other camper told us that he had a problem, too, and was told to unplug all the electric including the battery, wait 2 minutes, and hook up again. This might reprogram the circuitboard, and voila! It worked.

Posted on Feb 09, 2009

Thomas F. Schneider

  • 2715 Answers

SOURCE: How do I clean out the vents in my RV Dometic roof

Take it off,the plastic inside vents, with soap water and a hose wash it.  Outside condendor and inside evapator, making sure the drain is open and outside shroad removed, brush off fthe loose stuff. wet both units, put liquid dishwashing soap on both. Spray then through , with a hose untill they rince clean.  While up there. Oil the motor if possible.  Keep the drain clear and open,making sure none of the water is getting into the RV.

Posted on May 10, 2009

Anonymous

  • 127 Answers

SOURCE: Compressor doesnt come on in a dometic duotherm

If this is a wall thermostat controlled unit, then check to make sure that you have power coming from the yellow wire on the thermostat when it is placed in the Cool/Auto High mode. If you do not have power at the yellow wire, then you have a bad thermostat. If you do have power, then remove the control unit from the inside of the AC and see if you have power at the Y terminal there. If so, when you turn the thermostat to cool, can you hear a relay clicking in the box? If not, then you have a bad control box. If the relay is clicking, you need to check the power at the compressor relay on the board. It has a black wire to one side and a purple (or blue) wire on the outgoing side. Check to see if you have 120V on the blue wire when the tstat is set to High/Cool. If not, then you need to bypass the freeze switch to make sure that is not the problem. If you do, then you need to go upstairs and check the start capacitor for OK. It is located in the side compartment of the upper unit, it has a small black relay on the top called a PTCR. These often burn out and will cause the compressor not to work. If that is fine, then you go to the top of the compressor to the thermal overload switch. See if you have power at both sides, if so, then you have a bad compressor. If not, then the overload switch is open and not allowing power to the compressor.

Posted on Jul 04, 2009

motor1258

Mike Butler

  • 6674 Answers

SOURCE: My Duo-therm Brisk-Air by Dometic rv ac wont cool.(The fan runs )

Usually just listening closely will give you a rough idea where to look for problem. When you have the fan on and switch to cool, (with temperature turned down low obviously) do you hear any type of "moaning" sounds from AC unit, or see lights in RV dim slightly indicating that compressor is trying to engage? Is the breaker tripping when compressor tries to engage? Do you hear a "click" from AC unit when switched to cool? If none of that happens, then I'd start thinking thermostat, or compressor relay. Normally if it's a faulty capacitor, the compressor will try to engage but will make a "moaning sound" and usually trip the breaker due to excess current draw. Someone experience in electrical should be able to test relays etc, but whoever does work on it, should be aware that those capacitors, as well as hydro in general are very dangerous to work with. The ("zap",- Shock) that you can experience from a capacitor or hydro, can be fatal.

Posted on May 30, 2010

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Furnace won't turn on, off, with or without remote


We hotwired the thermostat wires and the furnace started. That told us that the problem was with the thermostat. We took our remote control to another camper like ours and our remote worked their furnace. That told us that the problem was in the ceiling control for the furnace/ac. But the man who owned the other camper told us that he had a problem, too, and was told to unplug all the electric including the battery, wait 2 minutes, and hook up again. This might reprogram the circuitboard, and voila! It worked.

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