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I can ensure it's not. Thanks for all of the helpful replies. Since I don't need gas i've thought of cutting out part of the ceiling and then getting it capped.

??? As I said, this is somebody else's doing I've uncovered.

Hi all, Ripped out my kitchen to make way for it's replacement. I have a lot of prep to do before the fun of fitting the new kitchen. The previous kitchen was fitted before we owned the house, they did a good job of damaging services. I've uncovered drill damage to the ring main (damaged...

Hello again, I am now doubting whether the air is entering through the vent. There is no question that the vent initially sucks a bit when the pump first kicks in, however it may not suck out all of the water in the vent pipe. I've been told a little bit of an initial suck is normal...

Cheers John, I cut into the 15mm feed and rodded down through the elbow. It wasn't blocked but my electricians cable rod turned from yellow to black, the inside of the pipe work is all black.

Hi John, Was hoping something like that wouldn't be posted. Will see what happens, if anything with the X400 over the next few weeks. How feasible is it that a 22mm pipe could be partially blocked? Unheard of?

Morning, I dosed the system with 1L of X400 yesterday evening. It's still early days so I am not jumping to conclusions but the heating was definitely quieter this morning. The frequency of whooshing noises is less and when it does occur it's only very briefly. Hopefully the chemicals...

Hi John, I'll scan in the manual page and post it up. When bleeding the rads I get black water coming out with small deposits, easy to see if I bleed some water out into a white plastic tray. Thanks again for your advice.

OK John, the Baxi manual does state either arrangement as suitable though. The cold feed wasn't blocked, I was able to rod it quite easily, bit of black on the end of the rod but that's all. If the boiler was full of sludge/dirt, what symptoms would you expect to see? If flow through the...

Thanks for the reply. The vent is less than 450mm but I cannot see how raising it will effect as it's not pumping water out the vent. An easy issue to rectify though. I am going to cut into the feed above the elbow and rod it through and then flush with cold water draining into a bucket...

Hi chaps, Drained the system this morning and cleaned out the F&E cistern. No brown slime any longer! I backfilled the system and then ran it a bit to get all of the air out. I then opened up the drain but left the cold water main supply on and just left the system flushing through. No...

Thanks yet again. Just a thought, what height should the F&E tank be at? Where is this measurement taken from? Highest flow/return pipework in system?

Thanks again, I'll reconfigure the feed pipe and report back. Any ideas on what " there must always be an open cold water path to the boiler return connection" means.

Thanks for the reply. Did you see my quote above from the Baxi boiler installation manual stating taking the feed in to the return side is preferable? Am I correct in thinking that the water level in the vent pipe is equal with the F&E cistern level? If so, will extending the vent pipe...

Hi JohnD, thanks again for your time and expertise. Yes, that's correct. In the summer I replaced all but one of the rad's and flushed the system through (although didn't mop out the F&E cistern, will do so now) so perhaps this cleaned system has exaggerated the ever present problem? I...

Thanks again chaps. Hopefully the attached will help further. I have described my labels in case I have incorrectly labelled. Mains water feeds ball cock valves in F&E cistern and DHW attic cistern. Feed is from pipe in bottom of F&E cistern. Vent is pipe that hangs over F&E cistern...