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Have tried doing the "finger test" on the pump; it is definitely running and you can clearly see the three speeds.

ADL, thanks for the suggestion... but since *none* of the radiators are now working, which ones would you recommend I shut off?

I posted earlier regarding some problems with a Glow-Worm 40FF boiler on an open-vented system. We have no hot water cylinder, just the boiler, a Grundfos pump and a fill/expansion tank in the loft. Summary to date: Radiators were working for the most part, but the radiators upstairs had a...

Update - things have gotten steadily worse since bleeding the radiators - so today I went out and got de-sludger (since the radiators that WERE heating up - now fewer than the radiators that don't - were warm at the top and sides, but not at the bottom or centre) and put that into the fill and...

It's also quite possible that the system does need to be cleaned out - as I said, this is the first time we've ever had any problems and therefore the first time we've ever really thought about the system as a whole, so it's probably got sludge I don't want to think about in there. This is...

Right, pump has been bled, radiators have been re-bled. I'll leave the radiators downstairs on overnight and see if they're warm in the morning; if that hasn't cracked it I'll have to try the balancing deal, although this could be difficult in one of the rooms because the radiator is not...

Gotcha, water's now maybe a little deeper than that - four or five inches - but there actually is water in there now. Now that's done, what would the next step be? I've noticed that the Grundfos pump is making sucking-air noises and presume it'll need bleeding too (that's "use a screwdriver...

Been up in the loft and wriggled the ball float around a bit - it seemed to be a bit stuck, and when it was firmly pushed down water did run into the tank.

The ball is just kind of hanging there in space because there's not enough water in the tank to float in at all - when I say "thin scum of water" I mean I'd barely get my fingertip wet if I put it in there. The boiler on the other side of the cupboard, I'm not sure what make and model it is...

If the black tank in the loft IS an F&E tank, is that meant to be empty, or should it contain water? It's got a red float in it, it's got lagging on it which makes me think it SHOULD have something to do with one or the other hot water supplies... The lid in that tank is not sealed down in...

Well, as I've said, I've never *seen* a hot water cylinder anywhere in the house (and I can't think where it would be if we had one - the "airing cupboard" is only about eight inches deep and doesn't contain a cylinder). Just had a look at the tank in the loft. The white one is definitely the...

Yes, when we flush the loo, the water comes from that cistern up in the loft (says my partner who's put loo blocks in it and the blue dye definitely winds up in the bowl). It's possible that there's a small tank wrapped up in the lagging with the big one - what would I need to do with that...

We do have a big square tank that's heavily lagged so I can't see it properly and a smaller white one. I had always thought that the smaller white one (at least) is the tank for the toilet, as that's meant to be in the loft and is not mounted behind the toilet like they usually are. What am I...

Hello I seem to be having some trouble with my central heating system at the moment. As it's gotten colder, I noticed that the radiator in our upstairs loo was only getting warm at the bottom, while the other radiators seemed to be warm all over when the central heating was running. After...