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Re: 'Tapping' Radiator
The usual thing is, the walls not quite flat behind the radiator so the brackets are not quite in planar alignment with the brackets on the rad. This makes the rad tight on the wall brackets.
Initially plastic covers are fitted to the wall brackets where the rad slots on but, because the fit is tight, after a short while these wear through until meteal to metal contact occurs and you get that characteristic ticking sound.
Soloution is to pack out the offending wall bracket(s) until both are the same flat plane relative to the radiator brackets.
Other things I have experienced are:
Rads that were slightly bowed that caused the same thing. Luckily the same remedy fixes them.
Underfloor pipework that is tight in its notches or short on expansion bends can have a similar effect but it's more of a knocking noise as opposed to a ticking noise.
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