I have Rheem HVAC system that is about 12-4 years old (its an R22 unit). Today it started blowing the fuse on the board when cooling kicks on. The tstat shows a message that says power failure, then 1-2 seconds later, the fuse blows, and the whole thing turns off.
Some additional background:
- I can run the fan by itself without issue
- I have an ecobee4 smart thermostat. Today I swapped that out for a 'dumb' tstat to rule that out as the issue. Same problem of blown fuses.
- About a month ago, I had the opposite problem. The fuse would blow when cooling would stop. I did all the troubleshooting I could Google, and ended up replacing the contactor in hopes that it was somehow shorting out when disconnecting. I used the exact same model number contactor. That seemed to fix it. Until now...