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Check around pump and motorised valves for manual air vents, should be at the very top of the highest pipes.

There is nothing wrong with using a (bent) 90 degree pan connector horizontally.

Make sure the system in not under pressure when you repressurise the vessel. pump up the vessel to required pressure with system at 0, then fill system and re-check.

Just out of interest, why have you waited 10 years to worry about the pipe being 1 foot from the wall???

As has been mentioned, its either electrolytic corrosion, or residue of flux, is the pipe a cold main??? are there one or two pipes side by side??? or does there seem to be any indication that another pipe was running along side??

Again you need to work it out on the pipe calc's, but I would guess it will be ok, you may only need to run 1 or 2 lengths of 28mm from the meter.

Turn it off at the main power switch and call back engineer who fitted PCB in the morning.

Well Its very possible that you need to upgrade to 28mm from the meter, BG are doing this on most installations of combi's now. Re-do you calc's and add on the heat inputs for you cooker and fire, will prob find you need to upgrade.

Hey thats my wife BOYO. :D

The glow worm is a great boiler, I think its got the top rating under sedbuk at the moment, however whichever you want to install make sure you incoming main can deliver the required flow rate.

Also are there any other appliances conected?? gas fire, cooker ect??

Ahh see its amazing what a little information can do, try what mikeyd said.

Yes please dont think i was being insulting, just wanted to check, sorry. Like I said it could be scale build up in the heat exchanger, If it has a plate exchanger this is most likley the case, but without knowing the model its hard to tell.

Please dont take offence, but are you competent to re-plumb?? If there are no problems with the new pipework then I would look at the possibility of scale build up in the heat exchanger.

Hi I have had quite a few simmilar problems with c,c pans from a certain Big & Quiet DIY store. it seems there is a narrowing in the neck of the trap of a huge batch of W.C pans from them, have had 6 changed now..

Could you post more info, like boiler make ect???

Hi try http://www.keeptheheaton.com/acatalog/Ideal_Thermister.html Its part number 173617 £8.69 plus vat. Hope this helps[/url]