Doubt its the fan without additional noises like squealing, loud humming, rubs, etc. What happens if you only run the fan without the compressor for say 10 minutes? Measure the current through the breaker with a clamp-on ammeter. Measure it first in the fan only mode. Then measure with both fan and compressor running. Is the current above the breaker rating? If no and its still tripping, replace the breaker.
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Archie
Irish Lady
1984 Monk 36 Hull #46
Currently in Cape May, NJ
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