Cold Radiators Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[sibaker]

Hi, I de-sludged my system a couple of years ago by draining entire system, after completing project one radiator downstairs remained cold. Lived with this, but yesterday i flushed and de-sludged system again, after refilling 2 radiators remained cold (both downstairs). Drained and refilled again today to see what happened and am now up to 3 useless radiators (all downstairs) thats all my downstairs heating gone. any ideas?

[bd3cc]

Airlock

[rosebery]

You won't desludge by just draining. Even adding X400 for a a while then draining again won't shift it all. If you have a sludge problem you can either add X400, wait, drain, remove each rad in turn take it outside and mains flush it through with a hose pipe or just powerflush the system.

However, I think your immediate problem isn't sludge its air. You haven't cleared all the air out of the system on refilling.

Clear the airlocks and you'll most likely be OK.

Cheers

[Steve the gas]

Hi Si,

Yep, prolly an air lock/blockage. We need lots more info- boiler make/model and system type.

[sibaker]

thanks fellas,
that seems pretty unanimous.

I might sound stupid but, how do i clear the air locks then?

Rosebury - don't worry I didn't just drain it, I did use the required cleaner. I haven't got a sludge problem, it was just supposed to be routine maintainance.

cheers
Si

[rosebery]

I wasn't worried but you didn't say! Never mind.

Cheers