Banging rad noise

[trevorbayliss]

A bath normal rad start banging when the heating has been on for a bit

if the thermostat on the rad is turned down a bit it stops straight away

any idea on the cause?

do I need to oil the pin

 

[ianmcd]

the trv is fitted the wrong way round

 

[trevorbayliss]

It’s been fine for 7 yrs.

bi directional

 

[Wayners]

They can knock if tvr is starting to engage as reached temp. Open up and all is good? Check the flow (which pipe gets hot first) tvr should be that pipe although some work on either side. Some have flow arrow on so look. If it's just started doing it maybe new tvr required

 

[ianmcd]

It’s been fine for 7 yrs.

bi directional

Well remove the sensor head and see if it stops it, most bi-directional rad valves a re cheap crap and still start banging as they get older