Fault code F22 on Vaillant Eco Tech

[Nicholas]

Hi David,

This indicates your boiler has a low system pressure. And you will need to repressurise the boiler to at least 1 bar. Underneath the boiler there are two valves. It will say closed on both valves.

You will need to rotate those valves a quoter of a turn anti clock wise. And you will hear the mains water recharging the heating circuit. Once the pressure anchovies one bar on the pressure gates for older unites and for newer unites between the two dashed lines on the LCD display. Rotate this valves back to initial position and press the reset button on the front which has a flame with a cross going across.

Best

Nick