Pump overrun On Glow worm Ultimate 50FF

[Chiswickian]

I have a Glow Worm Ultimate 50FF that has pump over run after the timer switches off. It is a sealed megaflow system. It strted a couple of weeks ago.
There is a brand new single fused pcb in it. All the stats are working and call correctly and valves open & close correctly. Everything else appears to be OK!!
Even if I remove the timing control panel, the pump still runs on.

Does anyone have any thoughts please.

(Can a sticking microswitch in an actuator valve cause this problem??)

Thanks in advance.

 

[jackso]

you need to find out if the pump is wired directly to the boiler or via motorised valves, if direct to the boiler the pcb is faulty if via a motorised valve chances are the valve needs replacing