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Old 04-01-2021, 02:31 AM   #6
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Very strange indeed.

I have a radon mitigation system and itís nothing like that.
Itís just a fan that creates a negative pressure under the foundation.

Pulls like 20 watts and runs 24/7.

Itís funny though, I have variable speed pool pump by pentair and
they are known to give some GFCI brands fits. I had an issue when
with a branch new GFCI breaker and had to swap for a different branch.

Electrical supply shop knew exactly what the problem was and said here this breaker will fix it.

My guess is it has something to do with septic system and preventing back gases or something.
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