Whistly Lockshield Valve

[scottpetrie]

Hi
I recently had a combi boiler installed and have noticed that one radiator has a bit of a whistling lockshield valve. The TRV is so sensitive that if I move it by 1mm either side of number 3, the radiator is either on or off. If I turn the TRV down it will quiten the lockshield valve but gets noisy if I turn it up. Any ideas? Could it be a bleeding issue or maybe just a tweek of the lockshield?

Thanks

 

[Wayners]

Recently had a hissing trv. Washed valve in sink. Few drops of 3 in one oil on trv pin. Pushed pin in a few times. All good now