I have a Lenox system that is AC only (my heat is separate). On occasions, maybe 10-20% of time, it doesn't cool and the fat refrigerant pipe coming out of the air handler going to the condenser outside is warm, whereas it's cold when it does cool. I think there is no refrigerant flow between the inside unit and the compressor when it's not cooling, there is also no water draining out, I took the hose out of the pipe and put it in a bucket to test
I had a technician come over and he confirned the system is properly charged with refrigerant. When he was here was the other 80-90% of the time when it works so I wasn't able to reproduce the issue. It was $150 for his visit to basically tell me everything is fine. To reproduce the issue, I would have to have him stay here until it shows again.
I am trying to get some ideas of what MIGHT be the cause of this happening before I spend another couple hundred dollars to be tdld the same thing.
UPDATE: I have determined that, when this is occurring, the condenser (outdoor unit) fan is blowing but the compressor is not, therefore no cooling is taking place. As per some research, I decided to replace the capacitor as it was easy and cheap to do even if it doesn't do the fix. Since this issue is only intermittent, I do not know if I just fixed it or not. Please see the other question I have about the difference in measurements between the old and new capacitor.