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By disconnecting the three wires of the heater (black, white and green), taking a megohmmeter that has a sensitivity of at least 20 megohms and taking a reading across the ground wire and either one of the other wires. If the meter reads infinity or "open", the heater is not ground faulted. If you get any reading at all, the heater is ground faulted and should be replaced.
I just had a customer last week who fried his IQ2000 controller because he continually kept resetting the GFCI. It kept tripping due to a ground faulted heater and the continual resets finally damaged the board. GFCI's are great, but they do not have an instantaneous reaction time.
: hmmm how do i test this nofault 6000? looks all sealed and wire going in
: each end...not like heater diagrams i've seen on the web. I ohm
: tested the wire terminals at the box and got 11. How can i test for
: ground fault on it?
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