drayton 3 port valve...fault?

[jacko57]

All signals seem to be correct to valve..is it possible for the valve to become sluggish when changing position?
from hw alone to ch alone valve arm moves..all though very slowly (guess this is normal)
and from ch alone to hw alone valve moves ok.
When on ch and then turn on hw it will move to a mid position.
but when hw and then turn on ch, valve arm barely moves maybe a few mm certainly not mid position
can they become sticky/can i service it?
its a TA 63-16
thanks.

 

[sime10]

Quicker to renew than service

 

[jacko57]

cheers for the reply

is this a common fault....guess it must be over 10 years old?

 

[sime10]

A very common fault, a service may or may not work its all according how bad the insides are
Defo renew

 

[jacko57]

Cheers S, tnks for yr time
Jack'o