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Shows my joined up thinking. Having been convinced it was the rad I've just topped up with Inhibitor. Do I need to drain completely with the X400 or can I add it to the system with ihnhibitor in it? Thanks. Markham

Thanks John. There are the usual main feed/return pipes around the boiler and tank that are copper in standard sizes. I've fitted a boiler buddy since the cleanse that traps some black stuff. Water is clear on draining rad. I susp that some of the plastic pipe is gas permeable. The system...

Thanks again all. I'm starting to think that JohnD is right and sludge is the only poss cause in the feed/exit pipes. Its a closed system and I would consider a power flush after a couple of weeks cleansing. I cleaned the system chemically last year (no PF) with some improvement overall and...

I've tried shutting all the other rads down and just leaving the problem one open but with no real improvement. I know it used to work as the radiator did work briefly when we first moved in. Thanks for all the advice. Keep it comimg. I'll try anything.......well almost.

Thanks for getting back. Really apprecite it. The rad is 700x1000. Its a repalcement radiator and I had the same probs with the original but thought it was rusted up. The TRV has gone back the same way. When it came to filling the rad I opened the TRV(on the exit pipe) and it filled. Should...

Hi I need some help and don't know what to try next. I've fitted a new compact double pannel rad. It has a TRV( direction dependant but fitted in right direction of flow) on the exit pipe and standard lockshield on the inbound. With the heating on, even when all other rads are turned off only...