mroman59

I purchased brand new 230V pump because my previous pump was humming when the low speed kicked on with the timer. Well my new pump is doing the same thing. However, it does not do this all the time. Wiring to tub is new, this is a new installation of a old spa that I refurbished. Since the pump is new and the previous pump actually looked in good shape, than the possible causes listed at a website are not my problem, at least those are my thoughts. I don't I have the following: 1. frozen shaft or bearings which may result in a humming noise - since the pump is new. 2. a jammed impeller (inside the wet end) which can do the same - not sure but the pump game with new impeller and hookup connections. 3. defective starting capacitor - again the capacitor is new and I even bought a new capacitor for the old pump and still got the humming noise. 4. badly worn bearings may cause a whining noise - when both new and old pump are running they sound nice and smooth. 5. Leaks around the pump often indicate a failure of the pump seals - I have no leaks. I am wondering if the problem may be related to the voltage that the pump is receiving. Even though it is a 230 line, is it possible that the distance traveled from pump to main fuse box is too long of a distance? I will check the voltage drop at the motor and the amperage draw. I am afraid that when the timer kicks and the motor just sits and hums that it will burn up the motor. I went out to check the tub and noticed that it had just completed the cycle set on the timer. The temperature was not up as high as it should of been and the motor was not running and felt hot to the touch. Also, I am wondering why it would do this at low speed, since the low speed probably requires less voltage on startup than full load. Any thoughts would be appreciated. Thanks, MR