Question about Dometic Rooftop RV Air Conditioner

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Freezing up The exchanger that provides the inside cool air is freezing up. It looks like the thermo couple came loose - it looks like it simply pushes between the vanes of the exchanger to detect how cold it is and allows the unit to cycle - before I put it there, I wanted to be sure that it doesn't mount somewhere else that I can see.

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That would be the bulb for the exspansion valve and should be strapped to the copper where it exists the coil...
But that is probably not why it is freezing up....
That is more likely caused by a slow leak that has the unit undercharged or a bad air flow...often caused by a plugged coil or air fliter...

Here is a tip for other things you can check....

Air Conditioner Trouble -Review the Possibilities


Posted on Jul 30, 2010


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Posted on Jan 02, 2017


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What are heat exchangers used for?

Heat exchangers are a commonly used mechanical element of a lot of day-to-day things. Some of the most common uses of heat exchangers are:

- As mechanisms in air conditioning units
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- To heat or cool swimming pools

Most manufacturers of heat exchangers provide heat exchangers to businesses for industrial purposes. Heat exchangers are an effective way of making the most of heat energy. A good example to illustrate this can be found in how heat exchangers are used in cars and buses. Most buses use heat exchangers to use the heat from the engine to warm the bus. This is a more effective way to use the energy than using electric heating. Car radiators are also a form of the heat exchanger as they use cold air from outside to cool the water and keep the engine working properly. The heat loss from the radiator is then used to warm the inside of the car.

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Heat Air Exchanger for Heat Recovery

An air-to-air exchanger is used to recover heating or cooling and to improve the air quality of the building that it serves. Typically an air exchanger has two fans, one blowing air into the house and one blowing air out of the house. In the winter time the one fan brings the outdoor cool air through the core warming it with the warm stale air you are exhausting. In the summer time the warm air from the outside will be cooled as it enters through the core to save on your cooling.

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The amount of air that these air exchangers bring into a home may vary depending on how the system has been installed. The codes in many places require a minimum amount of air to be exchanged. Check with your codes official to see what the requirements are for you.

Air exchangers can be a very good thing for many buildings. Especially those that are very large and typically have a lot of occupants with little natural air exchange from doors or windows being opened. However they are also a health hazard if they are not serviced

All air heat exchangers will require regular maintenance. The problem is that this is almost never performed by homeowners, and unless they know about the exchanger it is often overlooked by contractors during service calls. The real problem is that clogged, air-to-air exchangers can make the indoor air significantly worse than it would be without the system installed at all. If you have a home that already has a heat air exchanger, make sure that you keep it very well maintained or disconnect it.

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1 Answer

GE DL213908 Side by Side Refrigerator not freezing or cooling properly

It doesn't cool
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Make sure you dust off the condenser coils to prevent dust build up and overheating due to it overworking. Simply unplug and use a long coil cleaning brush to get rid of debris.
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If your refrigerator door seal is broken, warm air is pushing its way inside the unit, thus causing it to not cool properly. Prevent this from happening by replacing your seal and keeping the cool air inside.
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Could be a couple things...

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1 Answer

Why is my condenser freezing up, but my frig isn't cooling right? could it be the thermostat? Or is the condenser flooded?

when the evap ( the coil inside the freezer freezes up it blocks the coil causing no cold air to flow to the fresh food side. . the thermo is ok but the aditive defrost control or the heater or defrost terminator is or has failed .. mm ( you do have a defrost problem .. mm

Aug 16, 2010 | Maytag MSD2756G Side by Side Refrigerator

1 Answer

Runs steady, i have unplugged it for a day,no results,checked underneath and no freeze on coil,will make ice cubes in tray but breads,perogies, icecream soft couple of tubs of soup staying solid, its only...

ck for both fans going if fan in back has failed cooling will be reduced and if fan inside failed poor cooling . thermo in fresh food side is saying were not cold enough and is keeping the comp on . . also in the back of freezer ( not underneath ck for frost build up . ) any frost in a no frost would cause your problem .. mm

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2 Answers

Thermo wires came loose


The panel on the side has screws in it. Remove them and remove the panel. Then to get to the control panel, you have to remove the innet sheet metal panel.
Best regards, W/D

Aug 19, 2009 | Weather King 10AJA2501AH Air Conditioner

1 Answer

How do I use the air exchanger open or closed for best cooling? Bought a used in window unit? Thanks.

"Closed" cools best, but does not exchange air with the outside. Humidity in the room can have more of a tendency to freeze up on the coils, but it is relatively rare. Odors also tend to build up. "Open" allows some outside air to be exchanged with the inside air, but this is less effecient.
That was the long answer. What I'd do is operate it as closed as I could stand it, and leave it cracked open a bit. If I started having icing problems, I'd open it a bit more.
Regards, --W/D--

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2 Answers

Motor runs, freezer defrosting and fridge won't cool

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