On Mon, 28 Nov 2005 19:54:46 -0000, "Liz S" wrote:

As soon as my central heating pump kicks in - the very SECOND it does it -
then a very fast clicking noise can be heard in the bottom corner of one of
my radiators - much before any HEAT is in the radiator so it isn't
expansion. It happens whenever the pump is on and stops when it goes off.

Any ideas? It's driving me nuts.

LS.

Is it a thermostatic valve on that end?