"Roger Mills" wrote in message...
It's almost certain that one of these switches is stuck in the closed
position - even when its valve is closed. If you disconnect the valves'
grey and orange wires from the junction box, and check for continuity, I
think you'll find the problem - one or other switch is stuck shut.

A quick follow up for those still reading this thread.

Went back round the other day and checked the continuity of the grey &
orange wires on both valve actuators and both were fine.

Got continuity when the valve was open and no continuity when the valve was
shut.

Switched the power back on, system seems to be working again. System shuts
down when the valves are closed.

I'm wondering if my mother buggering about with the programmer might have
had something to do with it not working (though the timer was off when I
checked it out last time when the pump was still running).


--
Best Wishes
Simon (Dark Angel)
http://www.realmofhorror.co.uk
http://www.facebook.com/pages/Realm-...43030832454357