Large insulated Central A/C pipe freezing

Discussion in 'HVAC Heating & Cooling' started by songiuno, Oct 9, 2009.

  1. songiuno

    songiuno New Member

    Oct 9, 2009
    Telecommunications Field Engineer
    Ewa Beach, Hawaii
    I read this post about the smaller of the two central A/C pipes connecting to the condenser freezing. What does it mean when the larger, the insulated one, pipe freezes? I noticed this morning that the house was getting hotter and the fan wouldn't come on, so I went outside to look at the exterior unit and saw the following (photos).

    Can someone tell me if there's something I'm doing or not doing that would cause this? I change my filters close to monthly (sometimes goes 2 months) but otherwise I'm not sure what else might be wrong.

    Attached Files:

  2. gator37

    gator37 Retired prof. engr.

    Nov 10, 2009
    Retired prof. engr.

    I have not messed with these problems in about 40 years but a good service person may correct me but
    When you say the fan does not come on are you talking about the indoor fan or the condenser fan?

    Indoor fan not working typically will cause the indoor coil to freeze
    (assuming the rest of the system is working), not sure if it would freeze all the way back to the condenser or not.

    Frost on the suction line can also indicate low gas

    If heat pump it could be the reversing valve is stuck or not functioning.

    Sorry that is about all I remember
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