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Thanks for your help everyone. Just to hopefully close this off, a plumber came out as the x800 hadn't helped much. He took the connector for the expansion/cold/hot pipes off as he thought it might be blocked. And he was very right! (see pics) Hopefully this thread helps some other DIYers...

So I've replaced the pump, the old one didnt look like it was in a terribld state but it's a bit rusted up. The new pump seemed like it was doing the trick but ... It hasn't fully. More rads get hot but not all, and now the boiler has started kettling at times. I'm going to drain the system, add...

Ok it's starting to make sense. The pipes to the hot water tank weren't hot when the heating was on with no call for water. So I'm trying to take off the 4 Allen bolts on the pump but they are very stuck at the moment

Terry - it's thickening further! Turning off all rads except these got them to temp so I assume it's a lack of power in the system to cope with all the rads? I took the bleed screw off and checked the impeller is rotating fine. January this year - they cleaned the system I've attached a pic...

Thanks Terry. When I say the rads are getting hot I just mean downstairs, all the others are off. The two that aren't getting hot are upright tower type ones - I think they were put in by a previous owner as part of an extension and they didn't consider the power of the boiler / pump. They...

So I've tried again, upstairs rads off and downstairs fully open for 7 hours. All radiators except 2 are warm to touch, a couple are hot. 2 that arent warm never got that hot. What is interesting I think is the inlet pipe to the rads is boiling hot, the outlet is cold to touch - almost like the...

Evening all! Thanks Terry. So it looks like I can't get my downstairs rads to temp. It probably doesn't help that most of them have been installed backwards with the TRV on the outlet of the radiator rather than the inlet? I'm starting to think it's pump related but could it be something else...

Thanks all, downstairs rads are now getting hot. Will leave it a while to see if every rad downstairs gets to temp. Assume that rules out the diverter valve at least!

Thanks for the help everyone. I've checked the header cistern which all looks fine. Here's some pictures (excuse my helper!). I'll turn off all the upstairs radiators now and see what happens downstairs. Should I leave the heating off for it?

Hi Terryplumb Upstairs radiators are heating normally, as is the hot water cylinder. How can I tell if it's the pump? It sounds like it's pushing water around at the same speed as before. Thanks

Hello A mains water pipe in the area burst and meant the house was without water for ~7 hours. Since then the downstairs radiators do not get hot (no hot water to pipes feeding the rads either). It's a hot water tank type set up. There seems to be no change in the noise the pump is making...