"IMM" wrote in message
...

"obclare" wrote in message
m...
I have a problem with an Ariston a/23 combi boiler that has beaten
British gas and a handful of gas engineers.
The system fires up and immediately fires down again and fires up
again immediately and so on. Anybody any ideas? Various bits have been
replaced but to no avail. Very occasionally the system works.

Contact Ariston and see what they say.

I'd second that, their tech people have been very helpful to me.
They will probably recommend someone who has actually been trained on the
boiler :-)