Hi
I just fitted 5 TRV's to the radiators in my bungalow, leaving the one in
the bathroom as it was. One radiator, a double panel one in the living room
is causing problems. When the valve is just on the point of completely
shutting off, it starts vibrating really noisily........... if I press on
the top, it stops. If I turn it a fraction either way, it stops until it
reaches the exact point where it's about to shut completely. These were
very cheap valves..... about £5 each from Screwfix.......... however none of
the other radiators do this. I've swapped the tops over from another
radiator but that made no difference. There's no air in the rads. The valve
is on the in feed to the radiator however the valves can be at either end of
the rad according to the instructions. I had a look at the pump and it was
set at maximum speed and I've found that by turning the pump down to the
slowest setting, the valve stops vibrating and just makes a slight "clonk"
when shutting off. Is ok to run off lowest pump speed or will this cause
problems in very cold weather with the radiators not heating up enough. I
would have thought a bungalow wouldn't really need the pump set to high as
the rads are all on the same level.

Geoff