Hi, So all the rads were working bar one post putting sentinel x800 in...however now apparently the dining room which started becoming red hot has now started to only get luke warm. It's almost like something has been dislodged but then gone around and got stuck elsewhere? Does this sound like a blockage at the manifold, as surprised that something has changed the way it has? Any ideas? Maybe now is the time to put a hose pipe in the tank in the loft and see if a mains flush will help?
Does sound like there is crud flowing round the system and that possibly the Magnetic Filter is full and not able to take any more. Get the filter cleaned and back in and see how much it picks up in an hour of running - that should give an idea about how much crud there is. If the X800 doe snot sort it, you may have to resort to taking each rad off and cleaning, then running te system with just on open at a time to try and dislodge any more muck.
I found the X800 a very effective cleaner, within a hour of using it here, several radiators which I had problems with earlier & had been just warm, were now fairly hot.
Just as an update - I cleaned the very filthy mag filter earlier this week and I did the same again today, obviously it was less gunked up this time around. For the rads that were still not working, I opened the drain plug on each and emptied about 2 bucket full of water from the feed side and then same again but on the return (as someone suggested). There was very strong water flow on the feed and return (hence assume blockage got released when I did this) and lots of black sludge came out, but only fine little bits this time. - so I'm assuming the sentinel did it's job All the radiators are now fully working thanks to all your help - albeit the one in the lounge is only lukewarm, but I've played around with the balancing so hopefully when I go back tonight that will have resolved that (both feed and return water seemed quite strong when I did the bucket thing - the radiator also got piping hot!). Just wanted to say a big thank you to you all PS will put some inhibitor into the system on Saturday
Thanks for the update, alway good to have feedback. As well as the X100 inhibitor, you might find adding some Sentinel X900 Filter Aid as well, is beneficial to the system,as it will continue dislodging the crud, & you'll need to check fillter. https://www.sentinelprotects.com/uk...tral-heating-systems/sentinel-x900-filter-aid X900 is rather like Heineken, it's reaches parts that other cleaners don't.
Wow! Cool! What a result! As well as inhibitor, it might be worth adding X900 which is a long-term filter aid. I think it would be useful to keep that gung coming out, and inhibitor alone might not do that. Then visit once a month to clean their filter is you can. You're a hero, man ARGH! KIAB GOT THERE AGAIN!!!
Thanks for te feedback. If the one remaining luke warm rad is still not heating up fully, turn a few of the others off to maximise flow through it and then start to slap the radiator in the middle ant the bottom. You may have a sludge mountain that needs to be shifted and normal flow just goes over it. Slapping and rattling may start to dislodge the muck and get it moving.
I use a old cordless drill on hammer,with a piece of 12mm dowel in chuck to rattle the radiator, better than any tapping radiator with rubber mallet or whatever to dislodge crud.
Either way will do it ... as I said, I think there is a "mountain" of sludge in the one radiator which needs shifting.
If there is, and if it's a rad that you can access right through it from the valve holes - then it may be worth removing and taking outside?
All piping hot now - the couple are very happy! Turned into a massive project when I only popped around to have a look, but you guys have the pointers and I just followed instructions!!! Thanks once again