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The plot thickens. I just tried bleeding the pump, and no air *at all* escaped! While the screw was loose, I could still hear what I thought was air passing through the pump every now and again --- but nothing came out! Perhaps the pump is actually broken. Is there any way to check for that?

After those posts in November we had the powerflush, but problems remained. One radiator downstairs stayed cold, and when the system was hot, the boiler kept switching on and off in a cycle of about two minutes, as if the circulation in the system wasn't sufficient to dissipate the heat...

The downstairs radiators don't get properly hot, even if just one of them it turned on, all other radiators turned off. It's possible to get them no more than lukewarm. I think the system's pretty standard. GlowWorm Ultmate boiler downstairs, hot water cylinder upstairs, header and cold...

Saturday afternoon we noticed that it was getting very cold downstairs while the upstairs seemed OK. The boiler (Glowworm Ultimate) only ran for a minute at a time, then took a break of several minutes, while the pump seemed to be running all the time. Monday we had an engineer round. He...