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Thanks, the post is out of curiosity really. This causes us no issues at all. Just interested as to why it happens!

Ok thanks. To be honest it has only ever had a new siemans (I think) PCB and the seperate British gas pump went and was replaced with a new Grundfoss one. It has given us very few problems. Any ideas what would cause this though even just once ayear?

Hello, Got a Potterton Suprima non condensing installed in 3 bed small semi in 1999. There are 7 rads and a small HW cylinder in the airing cupboard along with the pump and 3 position valve and wiring centre. It is a y plan setup according to the gas engineer who services it every year. The...