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