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I used to have a vailant boiler in my old flat and had this error a few times. Usually was when I was decorating and replacing radiators - the water level dropped which reduced the pressure. I just opened up the water valve and the system refilled, then closed it off and the system was back up to pressure.
Have a look on YouTube, there are loads of videos from plumbers with these boiler errors.
Bainbridge
@plantasia
Hey can anyone help, I knew getting a f22 on a Vaillant boiler (low water pressure in the system) since yesterday. I have repressurised the system but it happened again in the morning.
Do I need to call an engineer in to take care of the problem? Can’t seem to find any leaks around the heaters.
Thanks so much for your help!