Replace
If after servicing you find out that it needs a thermostat or piston, nothing is really lost because it almost certainly needed a service in any case.
The 1800
www.showerdoc.com/sirrus-thermostic-cartridge-1850-968-sk1850-2
There is no real difficulty with this valve however it is a little more complicated than the 1500 just take photos as you strip it down you can then refer to them when you are rebuilding.
www.youtube.com/watch?v=mjrwvPjUMCU
www.youtube.com/watch?v=bQnHGckfW-g
Answered 5 years ago by Barrie Seabright
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