cracking from raditor Help and information on all topics relating to your central heating, air conditioning and ventilation issues.

[coantrim]

the gas heating comes on at 08.30 hours and goes of at 22.00 hours.
from about 15.00hours loud cracking emitt from one raditor, which is turned off- any advice= charlie.

[htg engineer]

Without more info it's hard to say what it is.

Do the other radiators have TRV's fitted - my thinking is do they shut down when the rooms reach temperature ?

therefore the pump is pumping against the radiator valves on the problem radiator - which are closed. Have you tried opening the valves on that radiator does the cracking stop ??