I have a Lennox 12ACB30-4P Value Series manufactured in 1996. It came with the house I bought 3 years ago. The unit never gave me any problem until 1 week ago when it would not cool. The fan would run, but the compressor would not kick in. There was a buzz every 20 seconds or so.
A tech was called based on the sticker on the unit (original installing company, but the residential service was sold, the new company still have service records.)
First tech looked and the wire was disconnected from the capacitor. He replaced it and cleaned it. All was well for 3 days, and there was no cool air again. The buzz returned in an interval of about 1 minute.
Called the company back and argued about cost of having to fix the same problem twice. Second tech came out the same day. The wire was disconnected again. This time, he replaced the capacitor and said the fan is running is reverse.
I thought I was crazy as I remembered the fan running in the correct direction (counter clockwise with air blowing out the top) before the capacitor was replaced. He left when the air is cool again (60F at the vent). I then turned off the unit by kicking the thermostat high. then waited several minutes.
When I started it again with the thermostat, the fan was running counter-clockwise with air blowing out the top. As soon as I heard the buzz and the compressor properly kicked in, the fan REVERSED itself to run in clockwise direction, with air blowing out the sides. I called the tech back, he said he has no clue and has to research. AFAIK, I do not think either tech has touched the fan itself.
Here are a couple questions:
1) Is it safe to run the AC in this condition? Would the fan motor and/or the compressor be damaged? I do not know if it was always running like this before the capacitor change.
2) Could the wiring on the capacitor be causing this? That is, could the second tech have wired the capacitor wrong?
Thank you. I appreciate any input.