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Freezing up is caused by
•dirty air filter or evaporator coil(indoor coil)
•dirty blower wheel or blower fan blades
•weak or slow blower motor
If air filter and indoor coil are clean may be low on freon. Blower wheels seldom get dirty on window units. Pull unit from window and clean both coils with a water hose. Careful not to get any electrical wet. Let dry for a while and reinstall. If it continues to freeze its a freon problem most the time.
most likely dirty filter and or evaporator (the cold set of coils), if not enough air get through it will cause the compressor and evaporator to freeze up into a block of ice. Let it thaw out then you can clean it out with a hose (evaprator & condenser coil) be careful not to get electrical parts wet. let it drain out and dry out - plug it back in and see if corrected the problem - if it did you should notice a considerable change in performance.
Hi Krystal. Not sure how old your AC is. But mine is 1988 Class C. My roof mount started today freezing up After being on only 1/2 hour or less.I took the cover off AC on roof and seen the cooling coil half full of ice building up. When It get fully packed with ice the inside air cannot pass thru coil to fan to recycle the cooled air back down inside RV.. I checked out this site.Fixya.It seems my AC may be blocked with dust in the cooling coil. So I cleaned it out with compressed air. You can buy a can of it in spray form at Wal-Mart.$5..Also FixYa suggested to change the air filters after you clean the coils. Take off cover in inside on ceiling and put new filters. Peferable ones that are able to breathe thru easly. Mine was pluged with dog dander and a bit of dog hair.. I may have to put my dog..in a bag...No I can't do that... But today and yesteday it was very hot and ******* the AC.. But I did attach a small fan under my AC to push more hot up into coils.. It did make a diference The coils started to thaw and drip water on roof.. But I still have to check freon pressure...I'm attaching a photo of my small fan It is only 5"across...Hoped that helped a little.......John, Cornwall, Ontario
Due to non maintenance of a/c. Col and air filter dust blocked. Due to this, some time ice formation over the coil will be there. Clean air filter, coil and blower wheel. And also drain pan. If you see any ice formation over the coil after service, it's meant for short of gas. Thanks.
if the fan isnt running or you dont get enough return air (on the furnace) the coil will freeze up or if you have it set too low it will freeze up overnight, make sure your filters are clean, and that you dont have any return vents (air sucking in) covered with rugs and whatnot. If you have animals, the coil (on top of the furnace) could be clogged with hair, even though you change your filters it still gets clogged with hair and must be cleaned. if your coil was froze up you need to make sure it is completely thawed out, run the fan in the on setting with the a/c off until you dont see or hear any more water then turn it on again. and finially make sure when the furnace goes off (thermostat clicks and is satisfied) the outdoor condenser goes off as well the contactor could have been stuck in the on position. if you cant fix it call someone who can when your coil freezez up it can cause slugging in your compressor (liquid entering the compressor) which will destroy it !!!!!!!!!!!
Low on refirgerant, or dirty coil, or it was run on a cold night. Either way, the only way to take care of it is to start by running the fan only, and shutting the cooling off. This will melt the ice on the coils. It is going to make a mess. Have the unit serviced if it is not dirty, if it is dirty clean it with an approved cleaner. Your local hvac repair shop should be able to recommend a good cleaner.
set your unit to fan mode only, to thaw the ice, after the ice melts, look at your evaporator coil, see if its dirty, if its dirty, then you might just need a good cleaning. if the coil is clean, look at your thermostat setting. it should not be all the way cold. the compressor would run continously and it would freeze the coil. third, the refrigerant system could be partially clogged up or it lacks refrigerant. these problems initiate freezing of the coil.