"Jon Rowlan" wrote in message
om...
The multifunction valve is the manifold at the other end of the Pilot
Pipe from the Piezo I presume?

I understand the principle now, but is a kink in the thermocouple
outer sheath likely to stop the thermocouple from working ...

It depends on how sharp the kink is. Thermocouples are cheap. get another
two and have one inside the boiler in case.

we tried to get a spanner around the pilot nut and pushed the
thermocouple outer sheath into a little "v" shape and broke the
insulation on the Piezo at the same time which now refuses to work.

Then buy an new peizo electrode.

It looks like the Piezo, thermocouple head and Pilot are in a block
and need to be replaced together - is it possible to buy and fairly
eay to fit each of these components individually?

They slide out of the block. Look harder, they are usually secured in some
way to the block.

If so, how can I check that its all working ... is there a way to
check the charge generated by the thermocouple?

There are some device to check these, but expensive. Get another
thermocouple and a spare in case. They are cheap. ...and new peizo
ignition electrode.




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