Baffling radiator problem

[dazzaangel]

Hi

Hope someone can help. The radiator in my ensuite only gets slightly warm while all others are roasting hot. I have tried turning of all the radiators but this didn't improve the heat, if anything the radiator is cooler! I have turned them all back on and the offending rad is heating up but still only warm. I have taken off the thermostatic valve to make sure it is not stuck in the down position and it is ok. The pipe entering the rad by the inlet is hot and th pipe coming away from the thermostatic valve is cool. The thermoshield inlet valve is fully open but i have noticed that when it is turned off then on there isn't the gushing noise that the others make when turned on so am wondering is thete a flow problem. It seems strange that the rad doesn't get hotter when the others are off even with lockshield open fully.

 

[Keefy]

Try bleeding it. With you saying there's a 'gushing sound' I'm suspecting you have a lot of air in the system.

 

[dazzaangel]

Hi, have tried bleeding but no air comes out, only water. The top of the rad is warm, bottom cooler. We have the dreaded double system of a combi and a gledhill system. Only 7 years old.

 

[REDSAW]

give the lockshield a slap

 

[dazzaangel]

give the lockshield a slap

I have turned the lockshield all the way on and off. What constitutes a slap?

 

[dazzaangel]

The rad has never really gotten hot I am perplexed as to why it doesn't get hotter when tge demand is reduced by turning all others off.

 

[mountainman]

The rad has never really gotten hot I am perplexed as to why it doesn't get hotter when tge demand is reduced by turning all others off.

Could be a dodgy TRV, try isolating and disconnecting the rad and opening each valve in turn into a bowl.
This will blow any air or carp out of the feeds.

 

[dazzaangel]

Could be a dodgy TRV, try isolating and disconnecting the rad and opening each valve in turn into a bowl.
This will blow any air or carp out of the feeds.

Am a total know nothing about these things, can't see anything on either valve that looks drainable.

 

[mountainman]

Am a total know nothing about these things, can't see anything on either valve that looks drainable.

Perhaps you should get a plumber in to do as I suggested.
Post your location and one of the forum members will most likely be in your area.

 

[dazzaangel]

Thanks, will have a look later to see if its any different. Will probably get a plumber though.

 

[Pelsey]

Sounds like the trv is knackered and the plunger is stuck down restricting the flow

 

[REDSAW]

give the side of the valve a slap/tap/rap with a spanner or metalic object to see if the jumper is stuck or if it pops open

 

[jase158]

is this rad tee'd off another rad?
is it 10mm or 15mm pipe connection to rad?
can you see pipework?

 

[REDSAW]

dont matter jase apparently wont work with all other rads shut down!.
its a blockage either pipe or valve imo

 

[jase158]

dont matter jase apparently wont work with all other rads shut down!.
its a blockage either pipe or valve imo

or piped off another rad so other rad is stealing all heat!!

 

[jase158]

or even piped off return from other rad so when other rad is turned off this is getting no heat causing it to go cold when other one is cold!!

 

[REDSAW]

The rad has never really gotten hot I am perplexed as to why it doesn't get hotter when tge demand is reduced by turning all others off.

2nd idea plausible lol

 

[garyplumb]

Dodgy Trv or maybe incorrectly piped ie 2 flows or 2 returns to rad so no flow.