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Thanks - all a bit daunting. Exit (pressure relief) pipe seems to be dry, so no sign of it sorting itself out. Could this be a temporary problem following non-use over the summer? Or should I call in an engineer?

I've just moved house and inherited a Worcester Bosch combi boiler, no manual/instructions, don't know model or age. I've never used a combi boiler before. I switched on the heating tonight and the pressure gauge went up from about 1.3, where it's been for the last week, to over 3 (4 is the...