Try turning the pump speed down.............. mine was set at highest
setting out of 3, reduced it by one and the problem was solved.

Geoff
"Hooley Mooley" wrote in message
...
I have just moved house and discovered TRVs for the first time. My heating
seems to "rattle" and the radiators vibrate at sporadic moments. Altering
the setting on *any* radiator in the house stops the "rattle" for a while.
At first I thought it was air and water "hammer" that I have seen
discussed
here, but I have bled and bled and bled till I can bleed no more and I
still
have the problem.

Is there anything I can try before forking out for the professionals??

Ta

Andrew