I have a shop heater with a 1/3 hp capacitor start,
induction motor driving the fan. Intermittently, the fan
motor speeds up significantly for several seconds (15-60
sec) then slows to normal operating speed. The manufacturer
suggested changing the capacitor which made no sense, but I
did it to no avail.
Could this possibly be caused by the centrifugal switch
intermittently reconnecting the start winding?
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