We've got a fairly basic Mira Go 8.5kW electric shower:
www.mirashowers.co.uk/onlinecatalog/detail.htm?productNumber=Go%20(8.5kW)
www.mirashowers.co.uk/onlinecatalog/pdf/1079319_w2_e_mira_go_electric_shower.pdf
It's nearly 3 years old, and has recently developed a worrying habit of turning itself back on after being turned off. The on/off is a push button, which I believe operates a solenoid. When it plays up, you push the button to turn off, the water stops, it hums/buzzes for a few seconds, then the water starts again. The button is still in the 'off' state - you have to turn it on/off a few times to get it to stay off.
You can buy solenoids on ebay for £12, but is it just the solenoid, or the whole solenoid + valve assembly, which are about £45? Would fitting one be a straightforward DIY job? A replacement shower is about £100, and I would get someone in to fit that.
We live in a hard water area, and I suspect the heating element is well calcified - if you take the shower head off and turn the shower on, you get a nice collection of grey bits in the shower tray. I guess the fact they are coming out rather than completely clogging the shower up is good, but it's probably on borrowed time. Perhaps something similar has happened to whatever the solenoid is (not) moving.
Any advice appreciated.
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