One radiator banging since fitted combi

[IANFLETCHER]

Since having combi boiler installed one 3 metre long radiator makes loud rythmic banging noises as system heats up and cools down. No previous trouble over 27 years!! Any ideas? Would shorter radiator do the trick?

 

[chrishutt]

3 metres is some rad! Must be expansion/contraction noise. You could try putting something between brackets and hooks on rad to allow smooth movement.

 

[gasgirl]

hi

have you checked that the TRV is fitted on the correct end of radiator? this can cause irritating noises from radiator. Should be fitted on the flow pipe..ie. the end that heats first.

 

[chrishutt]

Should be fitted on the flow pipe..ie. the end that heats first.

Not necessarily so, gasgirl. Most TRVs are now bidirectional, and even those that aren't can be fitted on the return if the valve is oriented in the right direction.

Nevertheless a good point about TRVs, but since the noise occurs only during heating up and cooling down, it doesn't really look like a TRV generated noise.