Hi,

Looks like Ive found the problem now with the heating. Fixed weeping
valves on the towel radiator and bled system again - cavitation noises
still evident from the pump and sound of air moving around the house
still evident.

Anyway, noticing that my hall was a bit cold I checked the radiator
valve on the hall radiator, noticing it was only 1/2 open I opened it
fully. From then on the noises got a lot worse.

So I turned off this radiator and the noises stopped! At first I
thought the problems were isolated to this raditor. I then experimented
by turning another radiator off and the hall raditor back on - no
noise.

Then turned all radiators back on - noises now evident again. Bottom
line is that by turning off one of my radiators the noises seem to go
away. I wonder if (since the installation of my large towel radiator -
prob. 4 x capacity of the radiator it replaced) I have overloaded the
system?

CM.

In article .com,
Charles Middleton wrote:
Anyway, noticing that my hall was a bit cold I checked the radiator
valve on the hall radiator, noticing it was only 1/2 open I opened it
fully. From then on the noises got a lot worse.

So I turned off this radiator and the noises stopped!

Sounds like the system is sucking air in through the valve spindle
gland seal. Try tightening the gland nut a quarter turn at a time until
it seals.

Charles Middleton wrote:
Hi,

Looks like Ive found the problem now with the heating. Fixed weeping
valves on the towel radiator and bled system again - cavitation noises
still evident from the pump and sound of air moving around the house
still evident.

Anyway, noticing that my hall was a bit cold I checked the radiator
valve on the hall radiator, noticing it was only 1/2 open I opened it
fully. From then on the noises got a lot worse.

So I turned off this radiator and the noises stopped! At first I
thought the problems were isolated to this raditor. I then experimented
by turning another radiator off and the hall raditor back on - no
noise.

Then turned all radiators back on - noises now evident again. Bottom
line is that by turning off one of my radiators the noises seem to go
away. I wonder if (since the installation of my large towel radiator -
prob. 4 x capacity of the radiator it replaced) I have overloaded the
system?

CM.

Could it be a loose jumper in the rad valve(s)? I had intermittemt
noises a few years ago that I eventually tracked down to a rad valve -
replaced it and no problems since.

--
Dave S
(The return email address is a dummy)