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how do I fix Vokera Flowmatic Combi Boiler?

WHEN MY HEATING IS OFF THE PRESSURE DROPS.
I TOP UP THE PRESSURE TO 1 BAR, WHEN THE HEATING GOES ON THE PRESSURE RISES TO 2.5 BAR.
CLIFF, November 2006
It's normal for pressure to rise when heating, but if you are having to top up I suspect you have a leak in the system.

Pete., November 2006
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