I have one of these inherently crap Potterton Suprima 30 boilers, which has
just let me down.

Refused to fire up the other day, so have just changed the PCB (thanks
Geoff). Bloody thing STILL refuses to work.

Only thing left that I can think of is the gas solenoid. When the ignition
goes to spark, the power to it is coming on, however (and I bloody wish I
realised this before) there used to be a "clunk" noise (which I assume was
the solenoid actuating), whereas there isn't now.

Someone did suggest (think it was geoff) checking the resistance to the
solenoids, which should be 4.2Kohm (IIRC), however I dont appear to be
getting any reading.

So, does this mean forking out for an engineer to replace the entire valve,
or is there a way of simply replacing the solenoid? Ive seen complete
replacement gas valves, but not the solenoid part and don;t want to be
interfering the the actual gas supply.

Any suggestions on how to proceed?

(looks like its going to be a very chilly xmas here)

TIA


--
Best Wishes
Simon Taylor