In article 6,
DerbyBorn writes:
?

Another thought - have the TRVs been fitted without ensuring the
boiler has a bypass route for when they all shut off?
Is there a radiator which doesn't have a TRV and can't be turned off
(lockshield at both ends)?


There is one rad with no TRV and whilst it doens;t have lockshields both
ends, it will not get turned off as it is the important hall radiator.

Is it a large radiator (which is likely to be set with a good flow
through it), or a tiny radiator which might have the lock shield
only open a crack (assuming the system has been balanced)?

When the TRVs start making a noise, I would try opening the hall
radiator's lockshield, and see if that stops it. Note exactly how
far you opened it, so you can set it back to where it was again.

When you have a radiator as the bypass loop, particularly a small
radiator, it may be that you have to increase the flow in it above
what is ideal for balancing, in order for it to cope with the flow
needed to maintain the bypass.

Is there a thermostat in the hall, to prevent the boiler firing
when the house is up to temperature?

--
Andrew Gabriel
[email address is not usable -- followup in the newsgroup]