Hot radiator

[azzvon12]

Hello all if anyone can help it would be appriciated.I Have just been to a large house,the central heating and hot water runs off a system boiler the hot water is then stored in a cylinder.The problem is that the heating for the house is controlled by two thermostats which are turned off at the moment but there is still a couple of radiators on the top floor of the house that are red hot the radiators have TRV'S on them which are also turned off the only way i could turn the rads off was by shutting off the engineers valves.I realise this could be due to multitude of problems but if anyone has any ideas i would appreciate the help ..cheers

 

[pauls]

not sure may be a problem with the 2 port valves at a gues

 

[Puddle]

when you say top floor is this a floor that has been added after others ie roof conversion
are radiators getting hot near cylinder
are thermostatic valves on return pipework

 

[Mike Jackson]

Most likely cause is reverse circulation due to incorrect pipework. The cylinder return is probably teed in in the wrong place.

Mike

 

[Bernie2]

Hmm!

Did they ever turn off?

Are the pins stuck in the TRV's? Had that a few times. Take heads off and gently release pins, try WD40 and grease with HT silicon grease.

Worth a go!

But really, as Mike says, you shouldn't be getting circulation if the motorised valves are closed, unless there is a pipework problem.

As you know though, its easy enough to say that, but where are the pipe runs in a big house and how do they go?

As usual try simple things first perhaps.

Good fortune! !!

 

[newbie1]

if this has only just started and assuming no recent work then i thiink incorrect pipework can be ruled out leaving problem with motorised valve/controller
however if new installation or rads have been added etc then yes pipework but that wld be a ballache job

 

[azzvon12]

Thanks for all the advice The TRV is broke as turning it off had no effect and the pin was jammed solid but it is really bugging me as to why the rads are hot in the first place and i want to do a good job.so i will investigate further.As Berni2 says trying to find the pipe runs in this place is going to be nightmare.Also in the boiler house there was no sign of the motorized valves so could they be locacted closer to the room stats?of which there are on two in the whole house both on the ground floor.Once again thanks for all the help. youve given me plenty to think about

 

[rob jefkins]

Your motorised valves would normally be situated close to the hot water cylinder.
Check that they are not closed. If so then the motor will need replacing or the wiring needs looking at.
I think however that if the pin on the TRV is stuck then obviously it is being bypassed and probably needs replacing.
Good luck
Rob