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Thanks for your suggestion, to fault find set hot water to 'on' on controller, turned cylinder stat up til it changed state and noted the valve opened, measured voltage across valve limit switch to prove it had activated, boiler and pump both kicked in, turned stat back down and noted valve...

Ok mate, supply to time controller and boiler via switch fuse, cyl stat wired from controller, valve controlled by cyl stat, valve limit switch wired to switch live on boiler pcb, pump wired to 'pump L' on pcb.

Hi, i have an s-plan central heating system in my house, pump seems to run on indefinitely after water has been heated, only solution is to turn off power to the whole system. Have done some fault finding and think the problem lies with the boiler pcb (baxi solo 3 pfl 50). Is this the likely...