Originally Posted by james6072
I have a Trane XL12 not cooling . yesterday the system froze up. Found the outside coil was clogged with dirt . washed out the coils and restarted and system cooled house down to 68degrees and seemed to work ok and ran fine for about 17 hours then if started getting hot again.It was 88 degrees both days. Furnace blower blows, outside fan blows, can't tell if compressor comes on. hooked gauge to the low pressure side with system off and was reading 120lbs. turn system on outside fan came on but the low pressure side still read 120lbs. If the compressor is working the low pressure should drop and hold around 60lbs right?? I don't know what controls the compressor. I know the outside fan has a capacitor to start it and it does run ok. I set the theromstat at 68 degrees and noticed the house lights dim every 20 minutes or so and the dim only lasts about 3 seconds then the lights brighten back up. I am thinking that might be the compressor trying to start and then giving up.any help would be greatly appreciated.
Does your compressor have its own start capacitor? If the lights dim, then it would be the compressor trying to start. The compressor has a internal over load that kicks off if it if it gets hot. Did you check the line volt out side?
If you are trying to bring your house down to 68, you might be freezing up your indoor coil, which would over heat your compressor. Let it stay off for a few hr.s and then try restarting it. Paul