mehran,
i hope you don't mind me contacting you like this but i have a problem with a vizo boiler and you seem to be a good guy to ask about it, i live in Middlesbrough and it seems you are or where a service engineer for heat line so if you have any advice i would appreciate it.
the problem i have is that the boiler shuts down every time i turn a tap on, it will run for a few seconds and then shut down, no fault lights or anything, after a little while when it has cooled down a bit it then re lights and runs for a few seconds then off again,
i would presume it it a thermostat ore temp sensor fault but need to know for definate and how i can fix it please,
sorry for the contact again and hope to hear from you soon
steve