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Ideal Standard Roca Twyfords Bristan Mira Manhattan ... Never had a problem with any of these :)

Sometime you can get away with unscrewing the plastic nut and wrapping some PTFE tape around the top of the pipe then tighten back up the nut (hand tight).

I don't see how turning a hot tap on would of helped. You just had an air lock. Turning off all the other radiators would have pushed this through and started to heat your radiator.

Or hacksaw the grey plastic bit of the end and then it'll push over the spigot and just secure it via a jubliee clip?

Press the + and - buttons together. Does this fire up the boiler?

Start from basics. What is the pressure gauge reading on your boiler?

Why are you trying to get into the diagnosis settings for?

I believe most insurance companies pay for the work to FIND the leak and the work to put everything right again (re-plastering etc) They do not pay for the actual repair of the leak (which is normally a very quick job - once found)

You've got to dig out a bit more and protect the pipes (all the way around). Whether you use denso tape to wrap around them or lagging. Then do as you say. :D

The plastic you're on about is old abs pipe they used in the 70's when there was a copper shortage. Do not touch this pipe until you have the fittings at hand. The fitting you need is a 3/8 to 15mm compression.

40mm should be big enough but if it doesn't cause anymore problem you might aswell run it in 50mm. As stated above try and put in a rodding point somewhere accessible. Obviously the more of a fall the better as shower wastes can easily blocked up with hair etc.

What boiler do you have? It could be the printed circuit board.

The problem is the pump valve. The system needs to be drained down and a new pump valve installed (there about £4). There is no need to change the pump though. To get you out of trouble you could try smearing some leak sealer around the leak.

Has the pressure gauge gone up high again? .. Because it looks like the filling loop isolating valve has been left open.

I would recommend it. It collects all the sludge in your system and every time I service a boiler I take out the magna clean filter, show the customer and clean it.

The 3 port diverter valve is your problem. Quite a simple fix.

Why wouldn't you use compression or pushfit under the floor? It's not gas.

I would personally get rid of it if you're going to be doing all this work seems the ideal time to get a unvented cylinder installed up there. Just don't put any chemicals in.

http://www.heatingspareparts.com/BoilerpartS.aspx?SearchType=Quick&SupplierId=27&ApplianceId=10024&SparePartsTypeId=640

Change to a two-pipe system. :mrgreen: