Central Air System Question

I'm not entirely certain I've found a solid answer from my search, so here's the question. Here in Florida, we've been keeping the AC at 75 degrees. If we want to dip down to 74 or 73, it's never been an issue. My mother was here today and turned the air up to 78. She turned it back down in the afternoon, but room temperature hasn't come off of 78. There's a line that comes out of the unit in the garage to the outside unit, and that part is icing up. The ice goes inside the machine on most of the copper pipe and the large round canister thing inside as well.

I think it's probably coincidence that this happened when my mother turned the AC up. I've read that it is most likely low refrigerant, or clogged air filters. Our large filter is just a couple weeks old, but i pulled it out anyway. There hasn't been any change in the icing or the temperature.

The HVAC unit is less than 3 years old. I believe it's a Goodman.

Thanks,

Steve

 

the moving of the temperatures that little wouldn't cause icing up that fast.if the filter has been changed religiously then we can say the fan squirrel cage is clean,and the coil within the fan section is clean?ice build up starts at the insulated line coming out at the air handler inside,and works its way out onto the compressor is what you have.was the system working OK up to this time then ice started showing up?freon in a system is like air in your car tire either it is there or it leaks out...to remove the ice run FAN ONLY in the morning then try the AC in the hotter afternoon and note the ice starting at the air handler....if it starts icing up within 15 to 30 minutes your short of freon.when was the last time somebody serviced (touched) your condenser section outside?if you set the stat to 60F and left it running overnight you might ice up overnight..might consider getting somebody in if the icing up continues at the 75F setting and it 80F outside.

 

My wife couldn't wait for me to figure it out and called a repair man. Evidently there is a leak in the evaporator core. The part is covered under warranty, but labor charges range from 425-550.