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Line to evaporator iced over

I have a Lennox model C26-51/65FC-1 and the line leaving the outside A/C unit is covered in ice (the outside unit seems to be running fine). The line leads to the evaporator unit inside my house and has the same condensate frozen on the outside of the insulated copper pipe. The evaporator housing is cold to the touch and has water condensing on it. The fan is running and blowing air out all the vents normally but it's not cold air. I've shut the unit off (but left the fan going) to get the ice to melt off the line. Is this a problem with the evaporator? I live in a small town and getting a qualified Lennox repairman has been expensive in the past. Wanted to try and verify the problem and solution before making the call. Thanks in advance!

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Yes it probably needs a high limit switch or something else that will turn the compressor off when the pressure gets too high or the temp gets too low. Or compressor could be shot, either way if you are not familiar with it you will need someone to come look at it.

Posted on Jun 26, 2009

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I am not exactly sure as to the type of unit you have. If it is a ductless split system (inside unit on the wall, never seen Lennox make one) you could be low on charge, the metering device to drop the refrigerant pressure is in the outdoor unit. If this is a whole house system, you may have a restriction in the outdoor section somewhere. If you look into the unit while it is running, try to find a filterdrier. It is a cylinder soldered into the small line. You can also see exactly where the ice starts, that is where your restriction is. Let me know what you find out.
seth

Posted on Jun 26, 2009

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