I had exactly the same problem from a 9.5 kw quartz electric shower. I rang Aqualisa and they advised changing the engine, Apparently these are sealed units and components cannot be changed individually. The cost was £111.00 inc vat. Only 3 months out of warranty, my dilemma was either to change the engine or buy a new shower at £180.00 (best price on the net). A friend of a friend worked for Aqualisa and got me an engine for no charge (long story)... fitted it myself in about 30 mins. Its working fine now only problem, the blue led light at the on/off switch is not lighting up. Another call to Aqualisa in the morning!!!
Kingpipster, October 2011
