Replace the 8 micro farrad start capacitor in series with the motor,
check it with a multimeter you should have a impedance reading of 398 ohms at 50Hz,.
The cap sometimes dries up and won't kickstart the motor,
if it isn't the cap which iam certain it is going on your discription, then the motor winding is faulty or the communicator is dirty or perished.
Start with the cap, easily fitted and around 3 quid,its a cheap repair.
paul, March 2012