Air Conditioner Freeze Up
Can anyone tell me what causes the coils in the interior unit of a central air conditioning system to freeze up? They are covered in ice and a puddle of about 2 inches of water is at the base of the unit. Any ideas? Thanks!
Answer:
Restricted airflow (ie: dirty filters) or refrigerant undercharge. If the latter, you likely have a leak. Others gave good answers. It can also ice up if the outside temperature is too low. Some people here in the NE are already calling with the problem. Nights here are in the 40's. Misdirected air can also cause it. I've seen people try to run these behind draperies and curtains. One other outside possiblity is that the outside unit is running all the time, even when no cooling is called for- thus no fan in the ultimate case of restricted air flow. I had a unit that was mis-wired, and it did this, as stated if the outside unit runs and no blower you have the ultimate restricted airflow case It could be mis-wiring or a stuck contactor in this case. ill second the opinion that the air filter is totally clogged or the coil isclogged. the blower fan gets pretty packed also causing lower air flow .you gotta move alot of air over the coil to keep it from freezing. lucas