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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.

  • @plantasia

    Usually this but if you've already filled it up, it's probably something else...

    Three things it could be:

    1. Leak somewhere (under a floor??)
    2. Blown PRF - has your overflow pipe (usually the other side of the wall to your boiler) shoved a load of water out recently that you can see?
    3. Diaphram has failed - you can check this and refill it with a normal bike or car pump
  • Thank you. Praying it’s not a leak somewhere inaccessible... timing couldn’t be better.

    Can’t see any water marks outside near the overflow pipe. Will research the diaphragm but probably try to call someone in.

    Does anyone know a good gas person in Nw10?

    Thanks again

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