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Mend Vaillant Turbo Max Boiler Water Pressure Leak

My Valliant Turbo Max Boiler loses water pressure?

The F22 code kicked in last year, now I check the display regularly and top up by opening the valve. It is getting worse. I now top up every 1.5 weeks. Worse when the radiators are on . I cannot see a leak. Access to underfloor pipes is difficult so before I get under there, could it be something else?I am beginning to wonder if the pump has a fault,but would this help to lose pressure like this?

Lancelot
December 2009
VaillantVaillant Turbo MaxHeating, Home Heating SystemsBoiler Water Pressure Leak
pressure relief valve is probably leaking (usually sticks outside below the flue). have it replaced & the expansion vessel re-pressurised.

Ian
December 2009

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Vaillant Turbo Max Boiler Losing Pressure - F22