Greenstar combi boiler pressure drop

11 Aug 2011
Reaction score
United Kingdom
I am experiencing a pressure drop problem with my Worcester Bosch combi which is 15 months old. When the central heating is on the pressure needle is on 1.5 bar,when no heat is called for the pressure drops to 1 bar and stays there. But when i turn a hot water tap on the pressure drops down to zero,when the hot tap is turned off it creeps back to 1 bar,also i have noticed crackling or air noises in the pipes above the boiler. I have checked all the radiators which are not showing any leaks,plus the boiler blow off vent pipe outside is not leaking water.
Has Anyone any idea what may be wrong before i phone Worcester Bosch service dept ?.
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Yes i did have the annual service done by Worcester Bosch and the book was filled in. The service was done in August last year.
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