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worcestercombi 28cdi rising pressure?

when the boiler is not working the pressure rises even when the water inlet valve is disconnected but when i turn off the house mains water stop tap it stops rising. seems there must be a leak in the boiler somewhere? but i dont know where.can anyone help pinpoint it.
graham fisher, January 2012
may be hot water heat exchanger has crack ,replace with new one

ltd, January 2012
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