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Brand new Dometic rooftop ac,freezes up at night,does fine during day...??

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This is common for most air conditioners and is normal due to humidity levels being higher at night causing more condensation build up and then freezing. Solution: Turn down thermostat at night to allow compressor to turn on and off.

Posted on Jul 26, 2009


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1 Answer

Dometic AC cycles on and off

sounds like you don't have enough of a charge in the system of "free-on". that would make the a/c cycle and cycle to try and keep the pressure up and would also contribute to the lines frosting and freezing

Jul 04, 2012 | Dometic Rooftop RV Air Conditioner

1 Answer

Ac freezes at night

Many air conditioners are not made to run at less then 65 F outdoor air temps. The pressures drop too low and they freeze could try to have someone check and make sure that it is not a bit low on charge... that would make it freeze up sooner...


Sep 14, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Rv ac throws the breaker when outside temp gets high, unit works fine at night when outside temp cools down

Clean evap and cond coils
Place hand on a/c if too hot during the day but cool at night
then freon is being restricted in the condensor
Cleaning coils may help days
Put a trickle of water on the condensor during the day for a test.

.If this was helpful please rate me.
Leo Ponder Appliance-Tyler,Texas

Aug 07, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

My rv air conditioner works fine at night but only clicks on during the day for about three minute intervals. It seems like the compresor should work harder during the peak heat.

First thing I'd check is the hydro supply to your RV. Test voltage at both times and see if it is the same. You can even buy a plug in tester if necessary, that plugs in to receptacles. It may be a case of everyone around you has AC etc on during the day and your incoming voltage has been lowered, thus AC will not work correctly, and at night when some others are off, your voltage comes back up to where AC will function properly. Especially likely if you are near the end of a power cable run. If you have access to a good generator even temporarily, try plugging into that during the day and see if it doesn't make a difference.

Jun 14, 2010 | Dometic Rooftop RV Air Conditioner

1 Answer

Dometic AC Unit is leaking

Your drain pan is plugged up and allowing the water to rise above the edge of the pan and into the coach. The best way to repair this is to get on the roof and lay down next to the air conditioner. Look underneath the unit and you should see two white nipples sticking out the bottom about 1/3 of the way back from the front. These are the drain ports for the pan. Take a wire hanger or a long pick and work it into the hole of the nipple. The hole is kind of small and it would not hurt to open it up a bit. If you are unable to access the nipples in this manner, then the AC has to be removed and stood up so that the pan can be cleaned.

Hope this helps,


P.S. The reason that it is only leaking during the day is because the evaporator creates more condensation in the hotter parts of the day than at night.

Jul 05, 2009 | Dometic Rooftop RV Air Conditioner

1 Answer

Freezing rooftop a/c

My home unit was doing that because it was low in freon and needed charged.

Jun 15, 2009 | Dometic Rooftop RV Air Conditioner

4 Answers

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?

Jul 06, 2008 | Dometic Rooftop RV Air Conditioner

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