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No - not wet patches. And no obvious leaks inside the house. Yeh, I have been otherwise, it causes the thing to "trip" and not fire up.

When it's only used for hot water, the pressure rises and falls, what I guess is normal (??), and remains around 1.5bars. When we had the heating on tonight, after it went off it dropped to under 1. Its done this before after the heating has been on.

I have a Worcsester Bosch combi boiler, when the hot water is used the pressure remains constant at 1.5bars, but when the central heating is on it rises to over 2, and when it goes off it drops to below 1bar. Help? Please??