While you wait for answers, we may have found some information which could help you.
Click here for Shower Hot RedGainsborough 8.5e ?
Gainsborough Energy 2000x shower stopped working?
How can I fix my Gainsborough ps1200 shower???
Gainsborough 2000x leaking from bottom of copper cylinder ?
Gainsborough Impulse 9.5 electric shower?
Gainsborough 8.5 se hot/ cold water problems ?