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Hi I have a Vokera Compact HE 25 which is exhibiting a strange issue in that when it fires up which it does quite readily, its flame goes on and its on for perhaps 2-3 seconds then goes off again for 2-3 seconds, then fires again, repeat endlessly. All the time the green light is flashing...

This boiler is starting to drive me mad as the pressure keeps building up to 3 bar at which point the relief valve keeps coming into play. So far in my vain attempts over the last few months to fix it I've fitted a new pressure relief vavle, a new 3 port divertor (complete assemby) and new...