Radiators will not heat up dispite red hot pipes

[David O'Bryan]

Hi.
I hope someone can help me I'm at my wits end....the rads I'm working on will not heat up no matter how much balancing I try!
The feed pipe to the rads are very hot but I cannot get the hot water into the rads?
Any ideas would be most welcome.
Thanks

 

[townfanjon]

The stupid question , are both valves open

 

[Chalked]

Looks like poor circulation.
What size are the pipes connected to the rad?
Also, is it open vented or sealed system?

 

[David O'Bryan]

Hi
There 15mm and it's a sealed system.

 

[David O'Bryan]

Condensing combi...

 

[David O'Bryan]

Ive tried shutting all rads upstairs off completely but downstairs stays cool, opened back up and upstairs now hot but down cold.......ahhhh

 

[Best]

Are there any zone valves? Always possible one is seized nearly closed.
Or any other isolating valves?
Or your circulating pump could be only partly functioning and if that is happening, the hardest to pump to rads with perform worst, such as on drops to downstairs rads

 

[Best]

Try turning every radiator off except one of the downstairs rads to see if it works

 

[David O'Bryan]

Ok thanks will give it a try tomorrow....no zones, upstairs does heat first and as we speak the upstairs rads are red hot but downstairs still cold...

 

[Riley]

I’d say pump. Heat rises n all

 

[Sharp Point]

One pipe system and badly sludged up??

 

[David O'Bryan]

Not smudged up....

 

[Harvest Fields]

What boiler is it? Is the pump inside the boiler or in the airing cupboard?

 

[David O'Bryan]

Integral pump inside boiler

 

[David O'Bryan]

Ariston eco combi

 

[Harvest Fields]

And you said the pipes into the rads downstairs are hot?

 

[Riley]

Has anything changed? New rads, new valves???

 

[David O'Bryan]

Pipes downstairs hot...no new bits?

 

[Harvest Fields]

Sounds like a pump or a blockage somewhere.

 

[David O'Bryan]

Is there a way to check the pump?

 

[Riley]

Depends on your boiler. What ya got?

 

[David O'Bryan]

Ariston eco combi

 

[Riley]

Then no as you can’t take cover off boiler. You will need a gas engineer mate

 

[David O'Bryan]

I can get to pump it's quite an easy boiler to work on, cleaned out heater matrix recently it came out in 10 mins easily...

 

[Chalked]

I can get to pump it's quite an easy boiler to work on, cleaned out heater matrix recently it came out in 10 mins easily...

You said no work had been done late ( four posts above)