(Hi I found this online and have used it to fix mine- obviously I accept no responsibility for what you do but I am not ultra techincally minded and I managed to do it...hope it helps) The Sanivite motor is of the induction type and there are no brushes to wear out nor can you open the motor assembly, If the machine has been installed in such a way as to cause the machine to overload or opperated with incorrect pipework or leaking non return valve the Motor start capacitor will eventually blow and the machine will hum. Isolate Machine from the Electrical supply remove the motor pump assembly from the box after giving it all a good clean up turn it upsidedown remove the pump cover plate it turns do not prise it off !!! to expose the impellor Push the membrane down a few times if you hear a clear clicking sound the Cherry Microswitch is working correctly and when the electric is turned on the motor will hum Now spin the impellor with a SCREWDRIVER (dont use your fingers it will take your nails off I know) if the motor runs up replace the motor start capacitor either from Saniflow Spares in the UK 01905 723746 or from Maplins or Radio spares a 10mf or 12mf in-fact any motor start capacitor of the same physical size and roughly the same rating will be work the lower the Microfarrads the longer the run time is if you go to low the machine will run backwards as did early Sanivite machines. Replace the membrane seal it with Red hermatite or Evostick contact adheasive lining up the line on the membrane with the line on the electrical chamber,silicone sealant works but takes longer to cure.
What ever you Do Not take the motor apart or you will wreck the machine and isolate it from the electric.
If you have any doubt in doing this job Call in the Local Service agents.
noggin the nog, October 2010
