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water pressure keeps rising, on valliant turbomax?

water pressure keeps going up,have tried bleeding it down to 1 bar,but still keeps going up it is now nearly 3 bar.
Henry Adams, May 2008
remove filling loop, if pressure rise stops, then you found your problem.

If it still rises (when heating is off & cold) then you may have a leak in the dhw heat exchanger across the plates, it will need to be replaced

T, May 2008
expansion vessel has lost its charge or needs replaced or filling loop is letting by

regards

steve

steve, May 2008