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Ok. Is getting the feed pipe changed the only sensible route? What about filling the system myself via the air vent shown - is it unheard of to have it not be an auto-refilling system until next time I have a plumber out for something? Or trying to unblock it with a snake or chemicals?

Ok I just opened the bleed screw while running. No water came out and I can see the thing is spinning fast. Does this confirm we are short on water? Further, I just tried opening that valve on the dead pipe there and no air came out. can I fill the system through that? Thanks for your help

Right. I removed the screw with the system off - didn't get any hissing or trickle of water but the screw and pump felt wet. Shall I try with the pump running?

How do you tell? I feel a vibration but there's loud swirling of air or water too

Before cleaning F&E they released nothing Now they release water (some a trickle, others spray it) but no hissing anywhere

Hi. I have an old back boiler. The system has an F&E tank and a Grundfos pump. This week I turned on the heating for the first time of the winter and the boiler turns on but cuts out quickly. The pipe nearby gets hot, but none of the radiators do. Around 5 years ago, a Fernox Total Filter 1 was...