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Hi I have / had exactly the same problem with my suprima 60. It would go to lockout upto 6 times a day. (cold showers aren't nice this time of the year!!) with the advice from this forum, i checked my PCB but didnt notice any cracks or dry joint etc so I just double checked all the connections...

Hi there The F and E tank is the feed and expansion tank and this does exactly what is says on the tin... it feeds cold water into the return pipe for the central heating (primary return pipe)...tops it up basically. (primary system being the C. heating, and secondary system being the hot...