Central heating problem

[kaaallen]

I have just had fitted thermostatic radiator valves and since then I get a noise occassionally which sounds like a pnuematic drill throughout the house. I assume it is something to do with the valves. How do I cure this

[AlBags]

Check there is a bypass valve fitted somewhere in the rad loop ... or make sure there is a lockshielded rad permanently open (like in bathroom)
You are getting water hammer ... may be caused by a valve going onto it's seat when closing off. Can you find and fix any pipes that are clanking together?
Check these first before you do anything else..

[Hymie]

Most thermostatic valves are directional – check that the flow direction for each valve is correct (normally indicated by an arrow, somewhere on the valve body).

[Hannahb]

Call the plumber back and get him to sort it out. We had this and narrowed it down to valves on specific radiators. Put up with it for 2 yrs as that plumber had gone out of business. In the end got another plumber and he changed the valves and we have peace at last! Cost a bit but worth it. Good luck.