overfilled boiler?

you have alot of air in your system or either you have a fautly valve at your filling loop.

anjum zaman
October 2007

You can dowwnload the manual for your boiler as a pdf file from the vokera website, there have been posts here explaining how.
There is an overpressure valve that you can manually (twisted) open to let off system pressure (manual page 1 fig 1 part 17. You need to remove the outer case first.

If the pressure is low when cold and high then hot then your expansion vessel is not working. It will need recharging, discussed here for example.

http://www.fixed4free.com/answers.php?id=68441

and elsewhere if you search.

The expansion vessel is a largish red container behind the boiler with a car tyre type valve on the top. For your model it has a capacity of a gallon (I cant see the pressure specified anywhere in the manual but somewhere in the range 12 to 15psi should be fine)

c
October 2007