radiator cold at the bottom puzzle

[josh10]

Hi
I am new to this site so excuse me if I don't post my questions
In the correct way.
3 radiators in our 4 bed house are cold at the bottom kind of warm ish.
I had plummers looking at it installing a pump and thousands of other things
Like flushing the system cleaning the radiators and even installation of new radiators
But believe it or not nothing worked.
Can anybody help us with this puzzle!
Would really appreciate that.

 

[Dan Robinson]

Can we have system details.

Especially if you have microbore pipe work.

 

[josh10]

Sorry.yes its a sealed system. Gloworm ultracom 30sxi with cylinder tank. The pipe
Work is the normal plastic pvc ones. Don't know what microbore is, sorry. But its copper pipes from the boiler but I think half way it changes to pvc ones. Radiators in the loft 2 of the are boiling so pressure wise its fine but the second floor is the problem.
Hope this helps

 

[bellairaphon]

What happens when you shut the 2 radiators in the loft? Do the others become piping hot?

Nathan

 

[Boilerman2]

The only reason can be lack of flow through the offending rads because:
Pump is weak
System is not correctly balanced
System pipe work is not correctly sized (design fault)
Sludge or obstruction is blocking Radiators or pipe work

 

[josh10]

No they are still the same. Even if we close all radiators in the house and leave
Them on still they are the same. We have done balancing too still the same.

 

[josh10]

Have to mention one plumber thought its a system pipe work error but he said
Its too costly to check as we have to open up the floors.and its wooden and tiles
In the house. Is there any way to know that for sure?

 

[Dan Robinson]

Are these normal rads or column type?

 

[Agile]

Anyone can only inspect what can be seen.

Or remove floorboards etc. to see a bit more.

Rads cold in the middle at the bottom are usually sludged up! That often needs power flushing.

Tony

 

[josh10]

Normal rads. Power flushing already done.but maybe was not done right!
But it took all day and £400. Also we installed new radiator on one of them
Just incase but was still the same. However, when we powetflushed the system
All the radiators were piping hot if that tells us something!

 

[duffin]

powerflush and all rads hot? pump shot?

 

[josh10]

Not sure pump was shot but I know the boiler was working at 80degrees.
And thats how they checked for flow. British gas people that is.

 

[Charnwood]

Pump shot is not an operation performed on the system.
Shot means cream crackered, cattle trucked, boogered etc.

 

[Steelmasons]

Possibly TRV's are siezed shut.