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Dometic Quick Cool compressor freezing and evaporator coil

My Dometic Quick Cool compressor is freezing and evaporator coil was frozen. I allowed the unit to completely thaw. Once it thawed it worked great but after 45min. the unit was frozen. Does this mean the unit is low on freon? If so, since it's a sealed unit - how would you charge it?
Also, does it take R22 or 134?
Your help is greatly apprieciated.

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Could be low. First check air filter, air flow, and evap coil to see if it has restricted airflow. If all seems well, its probably low. The specs will tell you what type and how much refigerant. To access system, you will need a gauge/manifold set, refrigerant, and a piercing or line tap valve for the low pressure side of the system. Of course, first, you need to locate and repair the refrigerant leak.

Posted on Jul 27, 2009

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A frozen compressor can be caused by several things. One cause could be partial loss of refrigerant or being over charged by someone adding to the factory charge. Another cause for a frozen compressor might be poor heat transfer in the evaporator, which is where the cool air comes from. This is usually systematic of a dirty evaporator or poor air flow coming from the fan. Another cause for a frozen compressor is the system not turning off when it should. This problem is usually a result of a bad thermostat or the thermostat not turning off soon enough.

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Make sure the mode is set to freeze and temperature is set to below the room temperature.

If it is a split system, check the outdoor unit whether it is running. If it is running, see if you can reach and feel the temperature of the pipes connecting between the indoor and the outdoor unit. It should be cool.

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When you thawed it, did you remove ice from it using a metal object. That may have damaged the coils when would allow freon to leak out. This is too coincidental to be a problem itself with the compressor. The t'stat might be the problem. Try turning it off at the t'stat for a few minutes, then turn back on to the normal setting. Keep door closed for 30 minutes and check the inside and see if the walls are freezing. If not, you may have a compressor problem, or t'stat, or relay switch problem.

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Coils freeze up. completely blocked. have to shut off to thaw coils. located in basement.


After the unit is totally thawed and dried, turn the unit Off if you haven't already and unplug it. Remove the filter and clean it. If it's really dirty wash it with warm water and dish washing liquid, thoroughly rinse it and allow it to completely dry, before reinstalling. DO NOT operate the unit without the filter in place.

Because the air temperature in a basement is colder at floor level, than at shoulder level, this caused the coils to freeze. Dehumidifiers do not work well at temperatures at or below 60 degrees F. That is, unless, it's a Low Temperature model, designed especially for basement applications. Obviously, yours isn't a Low Temp model.

To overcome this, place the unit up on a sturdy table, counter top, etc, that can handle the weight of the unit, as well as a full bucket of water. The higher off the floor the better. This way, the ambient operational temperature will be higher and the coils will have less of chance to freeze again.

I would suggest that continue to monitor the unit and if you notice that it's doing more than a little frosting on the coils, turn the unit OFF immediately. A little frosting is normal and the deforst mode should kick in and thaw the coils. When this happens, the compressor should automatically shut OFF, but the fan will continue to run. Once it's defrosted, the compressor will start again, if necessary.

I hope this helped you to troubleshoot and solve the problem. Please let me know.

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If the evaporator has frost on it, the compressor is running. The problem is, when there is frost or ice on the coil the air cannot pass through the coil, and therefore you have maybe some or no cold air. First, you will need to make sure the evap. is thawed out completely. You will probably have to turn the unit off for a couple of hours. When it is thawed, turn it back on. You are probably low on refrigerant. If you have the proper tools and a set of guages, you can do this your self . If not it's best to take it to a technician so they can check the refrigerant level. Hope this helps you.

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