Sounds like it will need a new heat exchanger plate,.
Have you tried resetting the boiler?
It may run for a while before it shuts down,but it will give you some hot water when asked.
As for the replacement plate,I would strongly recommend you get a pro in.
Its a easy repair and the new plate isn't expensive,
get yourself three quotes for the repair,maybe a service aswell,
good luck with the repair
paul, February 2012
