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Vaillant Ecotech 837 plus lossing pressure over 3 weeks?

I have noticed when central heating is off boiler pressure drops from 80% to 25% in 2 days. when ch is on takes 3-weeks.
How can I know if there is any leaks as visible pipe work and radiators look ok.

Patel
March 2008

Vaillant Heating, Home Heating Systems Pressure Central Boiler

Not 100% sure but if no leaks on system then probably an internal leak in your Domestic Hot Water (secondary) heat exchanger. Allowing central heating pressure to pass into DHW system.
Solution - Replace secondary heat exchanger. Old black "plastic" exchangers are known for this and are obsolete. Replace with new metal exchanger.

Colcreate
April 2008

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