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Nutone model cv-350 vacuum motor will not shut off. I have to unplug system in garage. I disconnected wire to house vacuum inlets and motor is still running. There must be a reset on the motor. I have turned the external switch on and off and still no help.


Answers :

Mine is the same, and it is the relay welding itself closed. The relay is switched by the low-voltage wiring that connects to the vacuum outlets, and it switches the motor on and off. Mine was welded in the energized position. I have cleaned and filed the contacts on the relay, and that solved the problem for about a week. I suspect the relay contacts were plated, or a worn motor is drawing a little too much current (it is several decades old at this point).
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