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Mend Vaillant Ecotech 837 plus Boiler Pressure Leak Heating Central Radiators

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
VaillantVaillant Ecotech 837 plusHeating, Home Heating SystemsBoiler Pressure Leak Heating Central Radiators
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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