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the pump seems to be working as you describe. It's set to 2. Paid £425 for work to date!

Hi. Very impessed with such helpful replies - thanks. My plumbing skills are zero (sorry, it's a girl thing) so I have no idea how to tell whether the pump is working or not. This morning the system worked fine for an hour before boiling over. Now it's a matter of minutes and no heat...

Have tried turning boiler temperature down, doesn't make any difference. Only the radiator closest to the pump is working now (others all cold) so there's obviously a(nother) blockage somewhere. Have tried bleeding this radiator, nothing comes out (neither air nor water). Boiler has recently...

Thanks for prompt and informative reply. tried heating again this morning - worked fine for about an hour and then started banging loudly again with boiling water pouring from overflow. Pump is working, rads hot (very!). There is water in the header tank - although probably a bit less than...

Hi. Having waved goodbye to the engineer who has spent all day power flushing my system - 2 hours later it is banging alarmingly and the overflow is pouring out (same symptoms before he came). Should I call him back with a few choice words or is there something else wrong? Boiler is a...