Hi, hope someone have time to help me with one of my lifes problems... I have currently two dead vacuum pumps, both having same symptoms.. When power is turned on, I can only hear a weak noise thats similar to the sound coming from a transformer. These are two vacuum pumps, one being a rotary vane oil pump and the other is a membrane pump.
I thoat in beginning that problem was in the starting capacitors... but changing them didn't help much..
Any idea what could be the problem? Does this sound like a foalt in the electronics or mechanics? What would be the next thing to check?
Thanks in advance