Question about Dometic Rooftop RV Air Conditioner

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Ilet the filter on my unit get clogged and it quit cooling. after i cleaned the filter it still doesn't cool.

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"If your dirty filter caused your problem,' it was because it restricted the air flow across the cooling coil. Often if the filter is clogged then the air will divert around the filter itself - and clog the cooling coil too, in which case you will need to clean the cooling coil.

The cooling coil is looped in a coil (hence the name) and is comparable to a car radiator. You will need to clean the fins (that are entwined around the coil) so that air - can flow unrestricted, over the coil.

This can usually be accomplished with a brush of some sort. Often you can use your fingers to peel the moist mat of hair and dirt off the front of the coil.

The problem (usually) is getting to the coil, because once you get to it - it generally is not that hard to clean. Your goal is make sure air flows thru the fins and over the coil - unrestricted of dirt, hair, or whatever.

Remember - many things can cause an AC unit to 'not cool' besides the filter being dirty - which is why I prefaced my answer with 'if your dirty filter caused your problem'

Good Luck!

Posted on May 03, 2010

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UNIT WILL NOT COOL. FAN AND HUMIDIFIER WORK. THIS IS ONLY THE SECOND SEASON USED AND THE UNIT HAS NEVER BEEN SITTING UP AND NEVER LAID DOWN OR TURNED UP SIDE DOWN. WHAT IS THE PROBLEM?


Hello,
A portable air conditioner may not cool for several reasons. Check the filter by removing the unit's grill and clean the filter.
Also check for clogs in the evaporator or condenser coils by light vacuuming. Make sure the evaporator isn't frosted over, but if it is, allow it to defrost and normal operation should resume.
Lastly, ensure the ambient temperature is lower than your AC's set temperature, as this can prevent cooling. However, if all of these steps fail to resolve your problem, the compressor may be malfunctioning, and in this case, the compressor needs to be replaced or repaired.
In summary, if the air won't cool, remove the grill and clean the filter. Clean out any clogs in the evaporator or condenser coils by vacuuming them and scrubbing them lightly with an old toothbrush. And since fan is working, you compressor might be defective.
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to me it sounds like filter are dirty, need to be cleaned or replaced, home systems, packaged or otherwise are hermetically sealed and should not need freon recharge. Always start with airflow and/or unit being set too low. An AC unit of any type will build ice if a) the filter is plugged up and can't move enough air, b) it has been run without the filter, clogging the coil, again, not moving enough air, c) setting an AC unit below 68 degrees F will almost ALWAYS cause icing, and d) running a standard AC when it's warm inside and cold outside (unless equipped for "low-ambient operation"). When in doubt, a bit of maintenance(thorough cleaning) by someone with AC skills can cure a b, common sense will cure c d.

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1 Answer

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There are a couple of things that contribute to the problem you're experiencing:

1. A dirty or clogged air intake filter. Turn unit OFF, remove and clean the filter. If filter is washable
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2. Cooling fins are dirty. Turn unit OFF, remove the outer shell of the AC unit, if necessary and
clean the fins with an old toothbrush and a vacuum cleaner.

3. Humidity level in your area is extremely high. This is Mother Nature's problem and is not readily
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4. Defrost sensor is not functioning properly. Replace sensor.

5.. Low refrigerant gas in the AC's compressor. Have compressor recharged.

Hope this helps you trouble shoot and solve the problem. Please let me know. Thanks.

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1 Answer

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