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Need to reset error codes on Vaillant boiler?


Vaillant Turbomax boiler, bled radiator nearest boiler and got two fault codes F20 and F22 . F22 is due to a drop in pressure which hopefully I can fix by topping system up ( any advice ?? ) The F20 fault is an NTC lockout apparently??? How do I reset this ?? Young family freezing at home, thanks for any help you can offer....

Lewi | Great Britain (UK) | December 2009




Check the pressure, should be 1 bar. If you have a leak or have bled the radiators then the pressure will drop which will possibly cause an error code of F20. If the pressure is below 1 bar then you need to repressurise the system via the filling loop.

Keith Gladdish | Great Britain (UK) | January 2010




To re fill the system you might have a flexible metal pipe and on the end of another pipe a metal plug and something that will look like some form of tap. DO NOT TURN THE TAP ON YET. Remove the metal plug and connect the hose, hand tight ONLY. Turn the tap on and the system will fill, keep an eye on the pressure gauge. When it reaches 1 bar turn the tap OFF.

After a short time the system should settle down. You could bleed the rads again to ensure the system is full, topping up as explained to fill the system. Once the system is stable, holding 1 bar then operate the boiler as you would normally.

It should work.

Keith Gladdish | Great Britain (UK) | January 2010




i have a vaillant combi boiler i ran out of gas put some in now its comin up with f20 help

karl | Great Britain (UK) | January 2012

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