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Mend Vaillant Boiler Losing System

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
VaillantHeating, Home Heating SystemsBoiler Losing System
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 242 EVaillant 824 ecomaxVaillant 824EVaillant 828/2EVaillant eco-tec plusVaillant ecotec 466Vaillant sine 18 T 3 WF HVaillant Sonnet 18Vaillant T3W CombiVaillant VC GB 242 EHVaillant VU282Vaillant VUW 282/1E

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