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geoff

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I have a potterton suprima 40 boiler that is starting to suffer
problems igniting. I'm well aware of the PCB problems that these
boilers have, but it has a new and working PCB fitted.

The ignition seems poor just now. There is a windows to see whats
happening inside and the blue spark coming from the ignition
electrode(?) seems very weak. I remember after it's last service how
strong it looked but now it is hardly sparking and is almost too weak
to see. The ignition electrode has been cleaned and on the advice of
some potterton forums it has been bent ever so slightly towards the
burner to reduce the gap.

I'm not sure what I need to replace though if I'm to fix the problem.
Would it be the cable from the PCB or the electrode itself? It is a
white cylinder with an L shaped metal arm and seems to act as a spark
plug. Can these be replaced? How do you do it and what are they
actually called? The bolier is 10 years old and has not had any parts
replaced bar the PCB.

Do you have a red HT lead ?

yes - the "cable" from the pcb to the electrode

are there 13 sparks, then it stops, sequences again twice and then goes
into lockout ?

Red HT leads are prone to not flame sensing - it would be a good idea to
change it anyway for the few quid it costs

--
geoff