How can I fix my Gainsborough 10.5 SCL Electric Shower?

no hot water is coming out of shower but running cold do I need a new shower or can I replace the engine

des
June 2015

I've dismantled several failed Gainsborough showers, 8.5kW and 10.5kW, and they all showed the same fault. There is a control diaphragm that sits between the input (mains) and output (heated) water that splits due to not being good enough for repeated on/off operation of the front push button. It's bespoke to this shower design so cannot be replaced with another part. Crap design and Gainsborough spares dept will only sell you a complete shower engine for want of a few pence worth of failed rubber. Shocking quality and service.

Russ D
December 2008

Hi Jack,
I had a play around but gave up and went down to B&Q and bought a new one. It took me about 5 minutes to fit it, and the old one went in the bin (the recycle bin, of course).
Cheers Matey

Chris Stading
June 2008

Hi, we have exactly the same problem with our Gainsborough 9.5E electric shower. We've called in a plumber today and he said we needed to get rid of that one and get a new one fitted. I'm wondering if you managed to fix yours or did you have to get a new one?
Cheers,
Jack

Jack Chlasciak
May 2008