same problem with my glow worm swift flow 80 i have been told its the diverter that needs replacing. the part should cost between 65 and 85 quid and should take no more than an hour a good honest plumber should do it for around 30 quid. not had it done myself yet have been switching the electric switch on and off and then putting hot water on. works most times but what a pain. good luck
paul.
June 2006