Recent content by BenDover

The valves are not thermostatic. They are straight forward on/off. They are fully open.

thanks for the reply. the plastic bits are present. The noise is internal and seems to come from the very end of the rad. No noise in loft.

I have a large rad in the living room of my bungalow. when the radiator gets hot, ie not as soon as the system is switched on a quite loud series of noises begin. In a cycle varying from less than a second to 3 or 4 seconds a hissing of ascending pitch followed by a ticking/knocking noise...