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Mend Vaillant ecotec plus 831 Boiler F22 Error

How can I fix my vaillant ecotec plus 831?

my boiler keeps discharging and losing pressure and shows F22 on the display. The system has been power flushed and is clear.

Simply Simon
January 2009
VaillantVaillant ecotec plus 831Heating, Home Heating SystemsVaillant Boiler F22 Error
Could be the Pressure relief valve. It may have been used to drain the boiler, which is wrong. Or the expansion vessel has depressurised.

Gasser
February 2009
is water leaking out from the overflow outside?

Ben
January 2009

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Vaillant Ecotec Plus 831 Error F22 - Fix