Faulty TRV

[mw_wright]

I have Myson 2 way TRVs on my radiators but there are 2 radiators that are not heating up.

All radiators have been bled and were previously balanced.

When I remove the plastic body of the trv from the radiator, the radiator will get piping hot very quickly so that side of things appears to be working correctly.

I compared the trv body with that of a working one and the pin that controls the flow rate does move but is very stiff in comparison.

Is there any way to adjust this or is it just faulty??

 

[Agile]

Try a squirt of DS40 ?

 

[mw_wright]

I don't think its stiff due to friction, more to do with internal workings I reckon.

On good TRV the pin was actually loose when on hottest setting.

On faulty TRV the stiffness of pin does change with temperature adjustment but not in the same range