Just in time for xmas, the heatings gone on the blinks and the local
parts shop is shut till next year ..

the diverter valve has started to 'stick' mostly fully out so at
least the hot water is still working , but it will not actuate when
the radiators are 'on'

its moving half way , then lock's ... this morning it actually went
the full distance and the heating came on .. now it will only travel
half way ... agen ...

if i take it off - is there any way it can be serviced ? ie cleaned ?
or do these valves end up with ware ridges that mean its 'worne
out' ??

see some posts about de-scaleing them , this has been in service about
15 years

Tnx - G ..