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Have you read the link? Why do you want to add doubt to the explanation? I only quoted a minimum and pointed to the link for full explanation The guy has actually spoken with Potterton Technical I do not see any reason to doubt what he has stated. Yes a by-pass may be a good idea but if keeping...

I have been given an explanation from an engineer with a web site. It would appear that it is a problem caused by all the TRVs shutting down together on Powermax HE with an older V1 control board. Explanation here - http://www.powermax-repairs.co.uk/Powermaxhe.html Regards Willdo

Thanks for that, what I was looking for - a positive answer. I will get the BG man to investigate.

I have signed a contract with BG and awaiting the initial visit so there is a service contract in place so yes I do consider the importance! If the cause of the A02 is something simple like bleeding the radiators then I am capable of doing that. There is no number after the HE it literally...

I have recently moved into a property that has the above type of boiler. It occasionally goes into lockout and displays A02. The boiler resets OK. It is worse it the CH is set to ON instead of timed. Could it be air in rads?