"ijabz" wrote in message
ups.com...


On Nov 4, 11:05 pm, "Sparks" wrote:
What type of system do you have?

Thanks for quick reply

It is a Vented System ( probably 20 years, small copper pipe
connectors). i think I see where youre coming from with the bleeding,
there may not be enought water in the system to fill the radiator, even
after removing the air, i think I have had this problem from time to
time with other a few other radiators when I have bled them (although
they stayed hot), I wil check this first thing tommorrow.

Ill then see if I can remove the head of the valve, I assume what is a
happening is the radiator is getting hot but then the valve is
calculating the temperature incorrectly and telling the radiator to
cool down again ?

Possibly, but as you said in your original post, "I turned on
the thermostatic valve but no water came out" I expect the head or valve is
broken/full of crud - Did you turn it full on?

I expect the heating while filling was due to the rad filling via the
lockshield, I assume you had the heating on at this point, if so, it would
be filling with hot water ;-) but it would go cold soon if there wasn't any
water circulating in or out via the Thermostatic Radiator Valve (TRV)

If either of the valves are off, then the rad will fill from the other, even
if it is normally the outbound flow valve.

You just said "It is a Vented System ( probably 20 years, small copper pipe
connectors)" How small is small?

If this rad was sludge up, then there could be a plug of crud blocking the
TRV - this may be pushed through if you turn off all the other rads in the
house and leave this one full on (on the TRV and the lockshield)

Do you have any inhibitor in the system - you really ought to!

Sparks...