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Thanks for the advice gas4you... will do so tonight. Taking a stab in the dark here (and going back to my dim and distant past of GCSE Science) if the vent is sucking in air then does that mean it is the path of least resistance for the water and thus that there is a blockage constricting the...

Crikey... the pipes into/out of the pump disappear under the floorboards immediately :( How did you track you're leaky joint down? Was it a case of tracking the pipe into the pump back and checking each joint? Or is there an easier way? My better half also does not like being cold, but...

Thanks for getting back to me so quickly! I shall tighten my nuts tonight :D I can't believe it could be something so simple :oops: If I can't tighten it any more, would internal leak sealant do the trick?

I hope someone out there can help me, I'm just about pulling what's left of my hair out with this problem!!! :? I can bleed the upstairs radiators fine when the pump is off - there is a good squirt of water when the bleed valve is open. BUT as soon as the pump comes on, air magically...