banging tcv

[bopper11]

hi all
hopefully someone can help,
we recently had new thermostatic radiator valves fitted on all our rads and a new thermostatic cylinder valve fitted at the cylinder.. all works well when the boiler is turned on until about 20 minutes later when a banging noise starts that comes from the thermostatic cylinder valve when its heating the cylinder. if i move the head it stops... is there something i can do that would be a more permanent fix as im tired running upstairs
thanks

 

[1983]

Are the pipes connected to it correctly? If the flow through it is in the wrong direction it may cause this?

 

[Agile]

Do you have an auto bypass valve ???

Tony

 

[bopper11]

Hi 1983 yes the pipes are connected correctly as the tcv is installed on the top pipe going into the cylinder as recommended on the tcv instructions ..
Hi agile I don't think there is an auto by pass valve.. Is this a small valve with a red wheel on it ??
Thanks you

 

[bopper11]

Hi 1983 yes the pipes are connected correctly as the tcv is installed on the top pipe going into the cylinder as recommended on the tcv instructions ..
Hi agile I don't think there is an auto by pass valve.. Is this a small valve with a red wheel on it ??
Thank you