see apart from the micro switch on the water flow adjustment knob i couldn't think of anything else it might be and the switch seemd to operate fine from what i could see the only thing i can think is that like you say they have installed it and instead of reading on in the manual and commisioning it they've just tried to use it and the cut out has operated its just annoying when you dont find out what the problem is and like i say i rang triton but apart from checking the water pressure they did not want to shed anymore light on the situation anyway i got them the number to call and like i say told them it would still be under waranty so hopefully they managed to get it sorted.