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How can I fix my Potterton Prima 40B Boiler?

Just added a radiator to the house and had a little leak, Ive sorted the leak and the boiler will ignite but none of the radiators are heating. Guessing the pressure needs increasing but I cant find a tap/valve to do so, any ideas?
Steve, February 2010
Thanks John much appreciated, is the centre screw the gold flathead screw when the boiler flap is down? Theres also 2 smaller gold flathead screws with IN and OUT beneath them will I need to do anything with these?

Steve, February 2010
try venting the pump by loostening the centre screw and vent the pipework in the airing cupboard via the bleed point, make sure the system does fill often cold feed pipes are blocked and need clearing

john, February 2010
link Click here to see other fixes for Potterton Prima.