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Ice buildup, why...


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Chris is dead on. The most common cause (90% chance) is a blown collant load. There is little to no coolant remaining in the system. Recommend to the buyer that he has the system checked immediatly.

Better yet, if the seller or seller's agent is around, recommend thay have the system checked today . Running the system under these conditions can damage it. They are also really running up their electrical bill. Assumiong closing is a month or so out, it will benifit the seller to handle it ASAP. That saves your buyer $s also. The seller can show the buyer a paid invoice from a licensed technician and all is well.


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It is very bad to run a unit in this condition. Air cannot circulate thru the coils, so it is forced thru every nook and crannies into the hot attic spaces. It condenses in the hot attic area. It will need to be resealed. It is also bad for the compressor. Low refrigerant is the #1 cause, but can be caused by other things. Low refrigerant indications usually are seen with the evaporator coils freezing up. You usually don’t see it backed up to the compressor as in your picture that often. It could also be caused by a bad compressor, high refrigerant levels, too small an orifice or expansion valve problem , coils clogged, or air leaks in the air return.

In your picture, the ice seems to be starting at the expansion valve. So that could be it. Looks like a York Unit.

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