Its a Leisure bay tub, if you flip the breaker it stays on for about 5 seconds then trips the breaker. on the screen on the control panel you see it do a 5 second countdown. if you press buttons it will do that function, but it still trips in 5 seconds. Large fuse is good. Am I missing something? I don't know much about them, just that I can't use mine right now, this started happening after a few nasty storms last week. Thanks -Corey

Probably the heater, circ pump (if equippped) or ozone generator (if equipped)

Try the process of elimination, starting with the heater. Remove both heater leads, and try again. The circ. pump and the ozone generator likely just plug in, so you won't need tools for those.