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Originally Posted by Mark McLeod
Fans were always powered, we've had no circuit breaker's popping.
I believe the FETs opened, but I'll have to verify and get back on that.
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Were the cases damaged? i.e. blown off or burned. Simple electrical failure of some of the FETs without case damage, may indicate a static problem. Were the same FETs involved in all cases with the same motor? That might be an indication of a bad brush assy. or a bad drive part in one direction.