A similar problem with AC unit?
I came across this thread in a google search and I am wondering if anyone might have some advice on the problem I'm having with my AC. The entire HVAC system was replaced 2 years ago and in that time has worked well. In an attempt to be conscientious about maintenance, we contacted a company to come out and inspect the unit, do any cleaning, etc. as part of a regular check up (in other words, there was no existing problem with the unit). A tech came out and looked everything over and said the system was in great shape, but because the readings seemed a little low he pushed some add'l freon in. The unit was not run again until the next afternoon and after being on for roughly an hour and a half I noticed that the house temp seemed to be going up! At first it did seem to be cooling the air. When I went outside I heard the outside AC unit kicking on for 2 or 3 seconds and then abruptly shutting off. It would do this approx. every 10 seconds. I ran back in the house and shut the AC off. We called the same tech and he came back out and (long story somewhat short) he drained some of the freon, which eventually let the outside unit come on and stay on. Apparently there was too much freon in the system, causing the high-pressure sensor to kick the unit off. So now the outside unit will stay on however, the system is barely cooling the inside air - a reading at the vent was 72 degrees where just the day before it was pushing out 62 degree air! The tech took some electrical readings and suggested that it appeared the compressor was failing. He insisted that "nothing he did the day before caused the current problems".
Can you please offer an opinion on this? I am FAR from knowledgeable about HVAC systems but it seems to me that if he pushed in too much freon, which put the system in high-pressure, which caused the compressor to kick on and off every 10 seconds for 1.5 hours that that could cause damage to the compressor - or the system as a whole. Another tech is going to have to come out to diagnose the problem (first tech was not able to) and I know that they will expect payment for diagnostic and repair, however I am concerned because IMO if they caused the damage, why do I have to pay to repair it?
Opinions and advice are appreciated.