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Sorry Just seen this, large red vessel as in tank? If the pressure needs topping up would that have happend when the new pump was fitted as in the pressure being lost . ?

cheers , the actual Model is a Mexico super 3 Gas boiler. Sounds i hope like the likely cause but in the loft the expansion tank is not present . Thats the twist .. any idea on that one ?

This sounds simular to my issues as well.,

No but he thinks is was a air / sludge block , he has come over to look at it and see if he can sort it but to no avail... He is a mate so cant be too hard on him . He fitted an identical pump to one that was replaced as it was making a grinding noise, bearing me thinks or something, Ideal...

Hey there guys . Had a new pump installed a few weeks ago. Now none of the rad`s upstairs are working. Thinking either that it could be air block but drainmed air from all but one of the rads, the other is one that we cant due to not being able to get rad key bolt out . or expansion tank not...