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Mend Saunier Duval SD 620 Pressure Heating Expansion Vessel

High Pressure on a Saunier Duval SD 620?

the boiler is filled to the required 1Bar when cold and recently has been exceeding the 2 Bar pressure when the heating has been on today it reached 4 Bar ! Any ideas?? Expansion Vessel - and how can that be checked ? PRV and how can that be checked ?? Thanks.

Martin
January 2010
Saunier DuvalSaunier Duval SD 620Heating, Home Heating SystemsPressure Heating Expansion Vessel

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