Low pressure
The water mains stopcock and any isolation valve in the feed tothe shower are fully open and there has been no reduction in flow or pressure of mains supply.
If all ok then yes would try the solenoid/pcb which can be ordered online by clicking on the link below.
http://www.showerdoc.com/shower-spares/bristan/NEWT-SP-092-2003-Solenoid-Valve---PCB-(MK3)
Answered 13 years ago by Anonymous
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Bristan Electric Shower 10.4kw - Matt Chrome Shower Spares
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