Sounds like the breaker is tripping due to an element... When it's wet outside I have 2 trees causing the my tripping. I believe I have identified the 2 culprits... Is it only tripping when you plug the LOR controller in? If so I would narrow down to what element or channel is causing the problem, by disconnecting it. If it's a metal element it could be shorting the circuit. If it's tripping due to over loading the circuit, I would plug it in to a differnt circuit for testing to help identify the culprit.