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My system was drained today so that a rusty leaking rad can be removed and replaced with new one. When the system was re-filled, a part of the house upstairs the rads are not getting hot at all. But every other rads are working fine. The rad that was replaced is actually in the part of the house...

Never have I come across a heating system like this! Apparently it's a consistent BG installation. I've got a Glow worm 38hxi with an expansion vessel connectted on to it with a pressure gauge. Does that mean it's a sealed system? But in the loft there's still the expansion tank which stores...