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S.0 means there is no demand into the boiler. Timer/room stat fault. To confirm this put a link between terminals 3 and 4 on the PCB. If all this is alien to you just get an RGI in.

Your neon screw driver only tells you that a live is there, you also need a neutral. You'd need a multimeter to check that. Check resistance through the solenoid, compare the two gas valves. You also need a multimeter for this. There's little else you can do really. I have to add that...

Sounds like you have an Isar not an Icos, is it a combi?

Sounds like you have an Isar not an Icos, is it a combi?

Who said anything about 28mm pipe? Not sure what you mean.

Do you mean 25/80? I suggested that earlier. Is it a sealed system? You can't just stick pumps anywhere on the circuit, fine if you can get them off the main flow but access might not be possible.

This is mostly irrelevant, all depends on the system size.

Worcester recommend 22mm on some of their 40kw boilers? Or do you mean that they recommend 22mm minimum?

Ha Why? For or against?!

22mm pipework from a 40kw boiler is undersized, you need to fit a Grundfos 25/80.

Can't understand why they've suggested an Ideal, they get a better deal on Worcester. If you wanted to supply your own boiler they can fit it as an upgrade (this will make sense to whoever you're dealing with. You've done well to get a new boiler out of them.

Yea the TE4. Don't get me wrong, it is good, but I'd expect it to blitz my Dewalt!

Yea I did, seems a nice fella. I've got the 22v SDS too, got to say I'm a bit disappointed with it! Tried it side by side with my old dewalt 18v SDS and the dewalt was much quicker. Not sure whether to take it back and tell Les.

Just bought an SDS and combi drill in a kit, heard good things so I took the plunge! It's expensive but I'm hoping it'll last till retirement and I'm 31 :D Also just bought a Marcrist ddm2 core drill and cores, also heard good things but not had chance to use it yet. Anyone used this stuff?

It's a whole £10, Tony! A customer can't go to a "competent independent", they can only go to an "independent". There is only an educated guess, at best, as to whether or not an engineer is "competent" even if he/she does specialise in breakdowns. If only it was so simple!

It's common on these boilers to find grey sludge in the sump and trap. It needs a good clean out and combustion test, as long as it's working and is safe just leave it. These boilers aren't great to be honest but no sense in changing it unless it's causing you trouble.

The water doesn't need to be 65c, 50c will do fine and I bet that goes a long way to sorting it.

What's the cylinder stat set to? Do you mean you set the CH valve manually open?

Try the pump speed and cyl stat first, save yourself the bother of fitting a gate valve for now.

Nothing wrong with that! You should see my pipework ;)