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Potterton Suprima 120 troubles...

I have just bought a new house and my Potterton boiler seems to be showing signs of a failing PCB as per the many forum entries.
- The pump continues to drive for hours after the timer shuts off and the water in the boiler is cold - Pushing the reset fixes things.
- It has failed to ignite the boiler on a few occasions now - Pushing reset fixes things

Now to my query:
No matter which timer is switched on, ie the water or the heating I can see both valves open - So if I put on only hot water both the water and heating valves open and same for the hot water only option.

Might this ALSO be related to a failing pcb or has the wiring of the components been done incorrectly?

I have a Drayton timer which shows how to wire the components together and I have the Potterton wiring diagram. Looking at the wiring in place the majority of the wires seem to follow the Drayton diagram but as this has not got the Potterton boiler PCB then I am unsure which diagram is correct or if neither are then how would I know which was wired incorrectly?
Drayton wiring guide

http://www.heatingcontrolsonline.co.uk/instructions/LP.pdf

Thanks in advance
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