I'm having an issue with my upstairs condenser unit tripping the breaker. It is a ~12 yr old York HLRA048S06D 4-ton 10 seer (?) unit. A quick history of this summer's A/C woes:
1) A couple months ago, the condenser unit stopped working at random intervals (condenser fan and compressor off, internal fan on, no breakers tripped). Compressor sometimes made squealing sound with the fan not turning. A/C tech couldn't diagnose at first, but then was able to determine that the capacitator was bad, which he replaced. A/C started to work normal, until...
2) A week after, the A/C started failing in the afternoons, 3-6pm at the hottest periods of the day. Internal fan runs as before, condenser fan continues to run but compressor shuts down for a couple hours, before turning back on and cooling normally. This continues for a few weeks, I didn't bother to call another tech as this seemed liveable.
3) Yesterday, the condenser unit started to trip the breaker. After resetting, it happened two more times, and started to run normal after 8pm.
It may seem obvious, but does this mean I'm having a compressor issue, or an electrical? I have already replaced the compressor in my downstairs unit this summer, and it seems to still follow in the path of afternoon shutoffs, so I'm thinking the compressor was weakened by the fan issues earlier, and now is failing. Anything I should point the tech to when they come out?
In case you're interested, previous threads:
Second issue (Afternoon cooling)