Boiler diagnostics advice

[ANDYF]

I'm assuming the boiler has packed in but before i go buying spares i wonder if you could help diagnose

Vented system, Suprima 60 or 60L, probably in since new around 2002

Boiler seems to be an older design as it has only 1 indicator.
HW Pump replaced when we moved into the house Oct 2013

With HW on, pump continues but boiler doesn't fire.
to me this could be a few things as to why it's not firing

With both HW and CH off, the HW pump is still going
this leads me to believe it could be the PCB.

The only manual i can find talks of two indicators rather than the single indicator.
There are lots of reports of duff PCB's in these boilers.

Any thoughts as to best way to diagnose?

Thanks

 

[Dotty]

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