Question about Heating & Cooling
A thick frost builds up on front of air conditioner sometimes
One of the best maintenance proceedures for a window unit is to take it outside, spray the coils (evap and cond) with spray cleaner like 409, simple green etc. and rinse well with the hose. This is needed every two seasons or so to maintain efficiency. Of course, allow it to drain completely and dry before putting back into service. Your issue is however typical of a unit with a slightly low charge condition. It will not hurt it to run so long as you set the thermostat to a setting that just avoids the condition. This can also happen if the thermostat is not seated against the front of the coil so it senses the temp properly.
My grandparents had a 30,000 btu Admiral A/C window unit a long time ago. It would cool the whole house. It quit cooling once, and they called a guy to service it. He told them it needed a compressor. They balked at it and asked me. After my brother and I took it out and cleaned it, It worked good as new.
Posted on May 22, 2009
Coil dirty filter dirty fan speed to low could be low on freon
Posted on May 21, 2009
Does the frost build up on one side or one corner of the evaporator? (The evaporator is the part that gets cold, looks something like a radiator.) If so, almost certainly a low refrigerant charge.
If the entire evaporator ices up, it's most likely an expansion valve or thermostat problem. Does it work at expected efficiency before it ices up or does it seem weak?
If the entire evaporator ices up it could be close to causing major damage, if refrigerant is still liquid when it reaches the suction port on the compressor it can blow out a reed valve, which destroys the compressor.
Posted on Jul 17, 2014
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Posted on Jan 02, 2017
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