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I slaved in my board into a friends boiler, all worked fine

checked the board all ok, it registers a tap being turned on so the flow meter must be working.....i guess thats what you meant by flow turbine. Any more ideas??

Hi, I have a buderus 500 combi boiler. The problem is if you have a shower and then someone else tries to have one 10 mins later the boiler will not fire up. sometimes it attempts to then shuts down a few seconds later. The central heating will also not fire up the system when in this fault...