Radiator will not work

[jowlewes]

We had a single radiator replaced 10 years ago for a double because the single wasn't heating the room up. Since that time the double has slowly ceased to function until we are in a postion now where it will not work at all.

We have just had a plumber in to look at it. The radiator has new valves; no blockages were found and a power flush was carried out recently on the whole system when we had the boiler replaced. He turned off all the other radiators in the house and still the rad didn't work. The inlet pipe below the valve into the radiatior gets hot but that's where the heat stops.

The plumber is flummoxed as everything that should be working, is working.

Any ideas?

 

[seco services]

will water flow from both valves if opened over a bowl ?

 

[jowlewes]

Yes, both sides work

 

[seco services]

then i would say the rad is blocked.
what valves has the rad got ?

 

[jowlewes]

That's what I thought but the plumber flushed it out and it appeard to be free of blockages. The valves are non thermostatic - don't know what type - bulk standard from Plumb Centre but brand new. This is sounding more expensive to cure by the minute! As I said in my first question, the radiator did at first work but has since stopped.

 

[seco services]

whats it on a vented system or sealed system ?

 

[jowlewes]

Its a sealed system - just had Worcester Bosch condensing boiler fitted.

 

[seco services]

i still suspect the return pipe.
will it keep flowing into a bowl etc if filling loop left open ?

 

[jowlewes]

I will have to look at that and see what happens. Thanks for your advice up to now. I will let you know.

 

[jowlewes]

We have just examined all the radiators in the house and the return flow from them all is a lot cooler that the in-flow. You would expect the return to be slightly cooler but not a lot cooler would you?