[cml32063]

My Trane AHU/CU cools great except that twice in the last 2 weeks the circuit breaker has tripped. Both times I have noticed it has got hotter in the house, I go out in the garage and the AHU Blower is blowing but the CU is not running. I check the panel and the circuit breaker is tripped. I reset it and the CU comes on and it cools great.:confused:

[KISS]

Oh how I hate intermittant problems:

Troubleshooting might involve:
1. Check operating pressures (service call)
2. Insulation test of compressor (service call)

So likely problems might be compressor breaking down and/or junk in the refrigerent lines.

An unlikely issue is that the system was moved from off to on without waiting and the thermostat/unit doesn't have an anti-short cycle delay.

It's hard to pop that breaker.

[hoseb2000]

It is also possible that the circuit breaker is weak and tripping due to that issue or the wires at the breaker are loose and overheating the breaker .

[mygirlsdad77]

Lots of queations I would need answered. New home with up to date wiring? Is your breaker big enough for the condensers amp draw? Does your conderser. Or thermostat have a time delay for restart? Is your condenser clean. If you have an old mercury thermostat, that is most likely your problem. Especially if you condenser is older than your thermostat. I would try a new thermostat if this is the case.

[cml32063]

Home is 4 years old... I checked the wires to the breaker yesterday... they were tight... AC was running great... But the breaker was warm, not hot when I checked it and the AC had been running