Bottom of Rad Cold on new system

[bjl]

Hi
We had our central heating system partly replaced last year with new boiler and replaced some of rads and got rid of pipework that was buried in the floor. As far as we can remember the system worked ok last year. noticed tonight that one of new rads was cool on bottom. all the others are hot all over. So i switched off all the valves to other rads and the cool one does get hotter, is this a balancing issue ? surely when it was balanced last year it would not need doing again??

 

[king of pipes]

Is your system open vented or sealed? was the system chemically cleaned and inhibitor added it is a common problem if it continues it will need addressing . kop

 

[bjl]

Is your system open vented or sealed? was the system chemically cleaned and inhibitor added it is a common problem if it continues it will need addressing . kop

It is sealed i believe no tank combi gas boiler. It had inhibitor put in when new boiler was installed but no separate chemical clean. Is it balancing issue ?

 

[king of pipes]

Its probably partially blocked it doesn't take much its needs isolating taking off and flushing through with a hose then puting back . cheers kop

 

[bjl]

Its probably partially blocked it doesn't take much its needs isolating taking off and flushing through with a hose then puting back . cheers kop

Would it have blocked up so soon especially as that new rad and system was drained and flushed when installed last year, why only that rad is getting blocked

 

[king of pipes]

Does not take much muck can get disturbed and can travel around the system , try doing what i said isolate both valves drain out the rad into a container or wet vac it out if possible plug the ends with blue roll take it off turn upside down to carry outside flush it through you will soon know if its magnatite. Cheers kop

 

[Damselfly]

I would be getting someone to try balancing the system properly before starting to dismantle things. If the radiator is getting hot when the others are isolated this is the more usual cause. It wouldn’t surprise me if they just fired up the system and went, just leaving all the lockshields in a fully open position.