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Dometic duo-therm air conditioner freezing up

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Make sure that you are not running the unit on low fan speed. In the warmer months of the year, this will often cause the unit to freeze up due to the lack of air flow through the evaporator. If you are running on high and it is still freezing, then you possibly have a freon leak in the system. The brisk airs are notorious for the capillary tubes in the upper unit rubbing together and developing a small leak. The problem is usually where the two small tubes enter the evaporator housing. Remove the cover and pull the two small lines apart, damage should be apparent if there is any. If not, you may have developed a leak elsewhere and need to have someone check out the system.

Hope this helps,


Posted on Jul 05, 2009


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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

  • 1 Answer

SOURCE: duo therm air conditioner

my duo therm air works beautifuly all day but at night when we go to bed it seams to turn on and shut off rapidly. what could be wrong?

Posted on Jul 19, 2008

  • 534 Answers

SOURCE: my dometic duo therm brisk air RV a/c unit is not cooling the RV

clicking sound could be thermal overload on the compressor. If the compressor has gone out the unit will not cool the clicking sound is possibly the compressor trying to reset but if the compressor has "gone to ground" (winding burnt out) you will need to have the compressor replaced. Good luck on your repairs hope this helped some


Posted on Oct 27, 2009

  • 6674 Answers

SOURCE: my Dometic duo therm unit sounds like it runs when...

Condensor fan at rear of unit may have a faulty relay sticking.

Posted on May 27, 2010

  • 246 Answers

SOURCE: I have a Duo Therm Quick Cool High Efficiency by

Any refrigeration unit 'can' leak, and 'no' that does not 'usually' mean you need a new unit. "Never say Never."

Actually, a 'refrigerant leak' is a fairly rare occurance and I would suspect that you probably do not have one.

You say 'the compressor seems to be working.'

Is it running?

Note; a good way to tell if the compressor is running is - by hearing it's distinctive 'rumble sound' when it's running - or by feeling of the compressor with (a) a screwdriver pressed against it to feel the viberation or (b) by holding your hand (be careful if you do this - it could be hot) against the compressor to feel if it's running or not. NOTE: ALWAYS BE EXTREMELY CAREFUL PUTTING YOUR HANDS INTO AN AIR CONDITIONING UNIT THAT HAS "LIVE POWER."

Once you've established that it is running - you can 'kind of sorta' determine how well it's running by the 'coolness' of the air coming out (which you've already said was not cool) or by feeling of the suction line (the bigger of the two copper lines going into the compressor/usually wrapped in black insulation). The suction line should be 'cold' to the touch (note: if it's wrapped in insulation - just peel back enough to get your fingers on the line to feel how cold it is).

I'm guessing your compressor is 'not running' and you are thinking it's running because the fan motor is running and hiding the distinctive sound of the compressor.

If it's not running then you are dealing with an 'electrical/control problem, or an internal (mechanical/electrical) problem with the compressor, in which case you will probably need to consult with an Air Conditioning serviceperson.

If - the compressor is running 'and not cooling' then you probably do have a leak - which also will require a serviceperson to 'find the leak and repair it - and then re-charge the unit.

Note: Things you might do "if the compressor is not running."

1. turn off all power and check for 'wires burnt off any connections - especially the compressor terminals.'

2. make sure both coils, (evaporator/condenser) are clean and you have good air flow
across both of them.

3. make sure your compressor - capacitor is good. Note; about the only way you (layman) can determine this is 'if it (capacitor) is 'bulged.' If it is - then chances are it's defective.

Posted on Jun 16, 2011

  • 413 Answers

SOURCE: Our Dometic Duo Therm Air Conditioner leaks inside

Hi, hopefully it is just your drain stopped up. If you can climb up on the top of the trailer, on your air cond. unit will be a drain. It will be about 1" around and will be located close to the bottom of the unit. It may have a hose connected to it or it may just drain on the roof. When you find this, see if it is plugged up with dirt, etc. You can stick something up in it to unclog it, but be aware not to jab the coil tubing with what ever you are using. You may be able to use a shop vac or compressed air also.

If it is not stopped up, depending on the age of the unit, the condensate pan, (which hold the water) may be rusted through. You will have to take the top of the unit off and a couple of covers to get to the front coil (looks like a radiator). The pan is underneath the coil.

Hope this helps and I hope it is the easier of the two. Mark

Posted on Aug 06, 2011

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