We may have found other answers which could help you.
Click here for 300 Years StoppedrReplacing a Switchmaster 3 way motorised valve with a Drayton 3 way valve?
Sunvic select 107 XLS + Glow worm ultracom hxi?
3 way valves?
switchmaster 805 not turning?
The timer is not working on my Switchmaster 905 heating timer?
Hot Water System?