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I think you might be right about the "water hammer" effect. Did a test with the downstairs tap and closed it slowly from fully open (so pressure didnt suddenly build up) and the boiler didnt do anything. Then did the same and closed it quickly and it fired up. Will see if a boiler engineer...

Hi there, I've just moved into a repossessed property which has been empty since Jan. In the last week we had the boiler serviced, 4 radiators added to the existing Worcester 24i (not junior) combi boiler, bathroom swapped out and a thermostatic shower added. Boiler is upstairs on landing...