It sounds like there could be a serious ground fault that only occurs because of a specific load coming on. Meaning, is it possible that this occures right after the homeowner turn on a large load like a pump motor or heater unit? If the ampere reading with typical loads on is not near the OCD rating, this is the only thing I can think that could be causing this to happen.
Bryan P. Holland, ECO. Secretary - IAEI Florida Chapter
