How do I top up the water pressure on a Vaillant 828E combi boiler?

Angie (and anyone else happening upon this site) -

I also had the F.22 error on my Vaillant ecoTEC combi boiler. I looked underneath and found two valves. I turned one, then the other, but nothing happened.

Happily, on another HowToMendIt thread, someone said to open the left valve, then the right one *while the left valve was still open*. (Left and right are per one being underneath the boiler with one's head to the wall.)

That was the answer to my problem. Now, if I could only answer the problem of my boiler installer's mobile phone number being no longer available 7 months after installation ...

Shazzbot
July 2011

Locate/identify the mains cold water supply pipe to the boiler. There should be a branch in this pipe close to the boiler, terminated with a valve. There should additionally be a branch in the central heating flow pipe with a 15mm non return valve connected to to it.

These would be connected to each other by a removable flexible hose. Recharging the system pressure is effected by opening the valve in the mains water supply pipe until the correct pressure is shown.

tamperman
June 2007