Bottom of radiator not heating up

[evets51]

I had a new boiler installed approx a month ago, this included a powerflush which I'm satisfied was done well as previously the water coming from the vent keys when I had an airlock was filthy black - the 2 airlocks I've had since it was installed the water is clear.

We noticed one bedroom didn't feel all that warm - I felt the radiator and it was hot. However it was only last week that I thought to feel the bottom of the radiator - its cold, only the top is hot. Previously this room was very warm so I think the bottom being cold is since the new boiler was installed.

From what I've read this is sludge in the bottom of the radiator. I've tried to contact the person who installed the boiler to come look at this but he's hard to get hold of - pretty busy I think and doesn't return calls. Overall I'm happy with the work he did.

Question is - in expert's opinions is this likely to be something that was "caused" by the installation, and therefore should I be pushing to get it rectified for no further charge? If not, then I'm happy to call another engineer and ask him to fix it - but something at the back of my mind says the room was warm before the new boiler was installed and now it isn't, therefore its a problem with the install ...

Thanks in advance

 

[folwlerg68]

could be quite an old radiator so even though you had the system power flushed the corrosion was already quite advanced. or have you tunred the locksheild valves down and not opened them fully ?sometimes the plastic head is not actually moving the spindle you need to take of and check with a spanner or t.r.v. might not be opened fully.

 

[PlumbBobBob]

yes it does sound like sludge to me. is it only on one radiator that you have a cold spot? easiest way to sort this is to take the radiator off and take it into the garden and flush it through with a hose. i think that the flush wasn't as thorough as it could have been imho how long did the installer take on it?

 

[glenno1]

are both pipes getting hot at the valve

 

[warrington]

If your system power flushed and system is clean.I suggest your radiators needs balancing. Turn of all radiators except one you having problem, once you have satisfied heat start to balance the other ones one by one.

 

[mountainman]

Bit worrying that your installer is hard to contact.
He may have done a good job but after sales service is equally important in my book.
Maybe I'm old fashioned!

 

[PlumbBobBob]

even if i was rushed off my feet i would return a call it may be for more work after all.

 

[SimonG]

even if i was rushed off my feet i would return a call it may be for more work after all.

Snap, but maybe the bloke knows there's a problem

 

[PlumbBobBob]

there's always that :cowboy:

 

[Mike Jackson]

If your system power flushed and system is clean.I suggest your radiators needs balancing. Turn of all radiators except one you having problem, once you have satisfied heat start to balance the other ones one by one.

That sounds about right to me. If the rad is still cold at the bottom with all the others off then it's sludge, if it gets hot it's a balancing issue.