Jumping in late. Great topic. We had a similar problem recently. Our chiller would trip off after running for about 10 minutes. Generator was not overloaded (the meter on our electric/control panel can be toggled to show watts to verify generator load). Did all the strainer and intake checks. No go. We were able to limp along putting the chiller in "eco" mode which worked fine as long as we started cooling the boat a couple hours before bed. Back at base after our charter it was found that clams (mussels) had been growing in one of the lines feeding the chiller. Lines replaced. Good as new. Wish I had been privy to George's last post at the time. Had no idea that sea life could get past the strainers and filters, but it makes perfect sense.