The following video is a simple step by step guide to servicing the cartridge used in the Bristan Easitherm series. The steps will show you how to remove the cartridge from the valve body, remove the pistons and replace the flow valves.
The parts that maybe needed are:
Cartridge: Either part no: 00650372 or 00622415.
Pistons: 00621143 & 00621141
Flow Valve: 00621146
These can all be ordered from www.bristan.com.
Post time: May-27-2017