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Can't afford the magnaclean. Tried rebalancing several times during the different things we've done. Has no effect. There is no extra heat to the 2 rads when all other rads are turned right off but we have water on at same time so having read another thread, that may be something we need to shut...

Bucket test done. All 4 entries/exits of the 2 rads emitted free flowing water without pump on, just under gravity from the header. Though both returns spluttered very briefly to start with. As all seemed to be working and water running clear replaced rads. Pretty much no effect on the radiators...

After reading all the replies Richard says that the only bit of the pipes that we don't really know whether they are clean or not are the returns on these 2 radiators. We are inspired to try and crack this ourselves with all your help and will do the bucket test next weekend. We will also be...

Hi Tony, Desludger was Sentinel Central Heating Sludge Remover X400. Put 1 litre in for 4 weeks as in the summer while in the loft noticed that the header tank had about half inch of sludge in the bottom. Cleaned that out before putting the desludge in. When we flushed the system the water...

It will be easier said than done! But we'll check, thanks. :)

This is for Tony, will get back to you later with what desludger it was and how much as Richard did that and isn't home till late. I can't believe people are interested in our problem! Thanks :)

Hi, we have 10mm microbore. It is interesting you suggest this as when we arrived at the house 8 years ago, the system had been put in by the resident's son, a young apprentice plumber. He cut corners by putting radiators in silly places, but also the place has a concrete floor and he cut into...

Hi Tony Sorry that you took umbridge to my comment. It was not meant in the way you took it. I was trying to be concise and not give too much detail as we had tried an awful lot of things, more than I wrote down. When living in our old house we put in our own complete water and central heating...

That sounds a good idea, not sure if we've tried that yet. Will have to check with the other half. At the moment we'll try anything as we're not convinced that a plumber will know much better and will charge us a fortune probably for going through what we've done already. We 'll have a go at...

Ok cheers bahco but we've drained and flushed the system 3 or 4 times. Is there a better way of doing this to be sure that the pipes are clear? Also do you think that there is any chance that either of these radiators might be corroded enough to cause this, even though we've removed them...

Thanks, but yeh I've read this. The only thing on this list which we haven't done or checked is the zone valve/3port valve not opening, but surely if the inlet pipe to both rads is hot then this must be working??

We have 1 luke warm and one cold rad in hall and living room. It started last year and have put up with it but trying to solve. Put desludger into system for a week plus and then drained and flushed system thoroughly. Refilled and not solved. Drained again, took radiators off, flushed...