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Yes there is a grub screw at the back of the tap. When I find something small enough to turn it, I hope the tap will come off! It's the unscrewing of the ring to access the headgear that I'm not sure about. I really don't want to damage it.

How should I undo the SS cover? What would be the right tool for that job? I wouldn't want to damage it with a wrench if possible. Thanks for your help!

Here's a photo of the tap: http://twitpic.com/3x65nn There's an alun nut at the rear of the stem but nothing apparent on the branches of the taps. Any idea how I'd access the head gear to check / clean the cartridge?

The system was drained to fit them. But the f/e tank was not cleaned at the same time. The build up of sludge in the tank in the f/e tank could well have been there for some time. The house is 30 years old. But you are right that the main circuit has minimal sludge in it. All the rads work...

So, in the space immediately after the pump (in this case, below the pump) might be doable? I see what you are saying about the pipe clips. I think the pipe is 22mm, not 28mm. Thanks for your help/advice with this - really useful. :o

Here are some photos As you can see, above the boiler there really is no room! Any ideas?

I haven't got much vertical 22mm pipe available to me. The boiler is in a cupboard and access to the return is tight - maybe about 2-3 inches exposed above the cupboard. Ideally it would go in the airing cupboard somewhere but by the sounds of it that wouldnt be a good idea! The towel...

This is the stuff. Its the sort that can be left in the system like sentinel x400. The difference here is that it removes sludge AND scale. I was concerned that i might have some scale to deal with. Nothing founded on fact mind! Good tip! i will try. All the rads are working well. All get...

Hi John, That makes a lot of sense. Yes, this seems to be the case. In that respect the F/E tank is acting as a filter, taking sediment away from the flow. This can only be a good thing! I'm happy to bail it out every now and then but 30 years worth was in there on saturday which...

I guess if a rad starts leaking i'll get it done then! Still no wiser as to the reason sludge is getting into the header tank though. If the vent>feed>pump is arranged in the right way (it is). And the vent isnt venting (its not) then the only way it can be getting up there is by travelling...

Interesting. I think i need to replace the valves then so the system at least meets the building regs! It makes sense to replace these three rads at the same time. Is there a method to test the rads to see if they are corroded on the inside so i know which ones to replace? Or should i just...

The plumbing seems right. It certainly is vent > cold feed > pump. Initially i thought the setup was wrong as in most diagrams ive seen the feed goes straight down to the boiler. But then i saw this diagram: http://www.sjsplumbingservices.co.uk/images/systemdiagram.gif which is exactly how ours...

Nothing from the vent pipe but what look like small bubbles from the feed pipe (not fast bubbling but image the odd small one comes up) Yep, that sounds like my system! Scary! An additional hassle to throw into the mix is that mine is an 8mm microbore system! So the pipes are already...

Last saturday i drained down my central heating system in order to clean out the feed and expansion tank. This was recommended in my home survey before i bought the house. I noticed that there was a lot of sludge in the bottom of the tank - about and inch deep of the stuff! Not the most...

Sorry to harp on about this. I just want to get this cleared up once and for all. Can I definitely remove radiators on a microbore system without draining the who C/H system down? (as in by tightening the lockshield and inlet valve). The only reason im checking this is because a plumber...

Thanks Olski. That makes sense, maybe it wasn't fully closed, just gave that impression. The rad was working fine so maybe it just didn't need to be opened too much. If that is the case, if i were to tighten it completely, would i be able to remove the individual radiator without bleeding the...

I also have a Microbore system. Does the whole central heating system have to be drained before removing a radiator? Or can you somehow shut off both the "water in" and "water out" valves on the radiator? Seems easy enough to shut off the "water in" valve but the "water out" valve is less...

I have solved the problem. It seems that the light switch was at fault. When i replaced it everything worked fine. Something inside the switch had blown. Thanks for all your help!

Cool, i'll do that. Now, what about those two red wires? Any idea what to do with them? For handy analysis, I've created a little image. Note that the original fitting does not have the earth marking on the third terminal. The new one does. here's my diagram: Many thanks for your...

Breezer, i think you are right. I think i do have an earth connection plate up there. This is what the current earth wire is attached to. And below that is the rest of the fitting: 2 black wires and two red wires. I imagine you are correct. This is very useful stuff and I shall investigate...