Question about Dometic Rooftop RV Air Conditioner

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15000btu roof top unit freezing up

The evaperator and the line going to it was a solid piece of ice unit was barly blowing air out in quick cool mode.Shut unit down for night now working fine what can i do to prevent this from happining

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Take a garden hose to the evaperator,probably dirty.

Posted on Sep 07, 2009

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1 Answer

Why is my brisk air duo therm rv ac freezing up on the inside.


Where you see frost all the time, wait for unit to thaw and start cooling again and carefully slide hand up in that hole and see if you can feel cool air leaking in from divider that separates cool and return air, that will cause freeze-ups as well. Use foil tape if necessary to stop any cool air coming in to return air from around divider. Also, if you have any diffusers closed, (on ducted system in ceiling) or partially closed, open them all up full flow. If you restrict the cold air from coming out too much, it can also cause freeze up. One more thing, take cover off where cool air box is and double check that something isn't restricting the flow of cold in to the duct work if it has ducted system.

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Temperature lowering problem.................


Are you referring to 16 degrees and 34 degrees?
If you are, it is not possible to lower the setting to 16 degrees, 32 degreees is freezing, so the evaperator coil would start to freeze up, and as the ice spreads across the coil............... Air can not flow through ice, so the air will stop blowing, till you shut the system down for a couple of hours, to allow the ice to melt.
This is the reason why these units are set with min. temp settings.
I hope this helps.
Sincerely,
Paul Gibson

Mar 29, 2010 | LG Heat cool Window Air Conditioner

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I have a Frigidaire cooling and heating unit. Last night we had freezing rain and ice. I heard a weird noise coming from the unit then smelled a burning smell. I turned the unit off. The top vent...


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Jan 29, 2010 | Heating & Cooling

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Dometic air conditioner blowing cool air


When the cooling slows down, but water is still running off, usually something is icing up. You can turn the unit off, and let it thaw, and try again. Sometimes, if the humidity is high, this is more pronounced. It sounds like you are low on refrigerant. That implies that you have a slight leak. You should have the unit serviced, and the leak repaired.
Best regards, --W/D--

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If the coil is clean, then have a tech check for a low charge. This will cause the coil to freeze up. Humidifers are known to lose gas and owners aren't told this so end up buying new one and scraping the old one. Trust me on this. I have seen this many times. I repair high end machinery as my business.

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Neither Roof Air Works


Yes and no .. Freezing temps should not affect your A/C at all ... BUT .. there is a freeze control box, its called a control unit to prevent itself from freezing up and burning out, take down the lower cover and you will see it. Your problem is more likely to be more central since neither are working Thermostat or even the control box's in genera, even could be a freon problem if the cold weather was really bad and you could have a leak on your lines, check it out and see what you got!

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Same problem. I have a 2005 on a Rockwood Roo. Worked fine in October 2009. Not working June 2010. Problem is not a freon leak, compressor went bad. I banged the compressor gently with rubber mallet then with a hammer but that did not work. The fan runs, the compressor runs but gets hot. Also no indication of freon moving through system as everything gets warm from the compressor outward.

Aug 25, 2008 | Dometic Rooftop RV Air Conditioner

1 Answer

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Shut off the cooling and leave the fan in the on position. If the A/C cooling coil is frozen over it will stop air circulation. After you shut the cooling off look down through the fan on the roof top unit and look for any sign of ice on the big line going to the compressor. This would be a sign of the frozen A/C coil. After about an hour or so you should start to feel air movement.

To prevent the coil from freezing up operate the fan in the on position while the air conditioning system is in the A/C mode. Not automatic.

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If the top of the compressor is freezing you either have low refrigerant or a restriction in the coil. Check the air filter and change if necessary. Turn the outside unit off using the outside disconnect found a few feet away from the condenser. Let the indoor unit blow air for a few hours to melt the ice off of the coil. Turn back on the outside unit and after about a half hour, you should feel the cool air from your ducts. If the cool air gets warmer over the next hour, you will need a tech to look for leaks and recharge your unit. If it continues to blow warm air even after the 3-hour wait, you have other issues. To answer your original question, on the indoor unit you will find access panels that can be removed for inspection and cleaning. They are commonly located where a 3/4" drain pipe exits the cabinet. While the unit is off, remove these panels and inspect for a buildup of debris. Good Luck!

Sep 11, 2007 | Heating & Cooling

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