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Carrier A/C unit not cooling..but freezing refrigerant tube.

I have a Carrier furnace and A/C unit. Model # CD5BXA06000AAAA. A few days ago I noticed a puddle of water on the floor at the base of the A/C unit. The refrigerant tube was condensing and freezing over (both inside and outside). When the unit is off, I hear what I think is large ice blocks dropping inside the unit. Set on 'AUTO' it no longer turns on and off automatically. Water does drip from the condensate drainpipe, although i dont think as much since i have noticed this problem. Cold air is coming from vents but not cooling the house (3200 sq ft). Any suggestions?

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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 !!!!!!!!!!!

Posted on Jul 21, 2010

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