In article .com,
kiich wrote:
With the system all switched on - ie heating and hot water - turning
down the cylinder stat (you should hear it click) while the room one
is higher than ambient temp should force the motorised valve to the
heating position, and you should hear this happening.

ok - here is my steps:

1) set the boiler program to be for both HW and CH 2) boiler comes on 3)
turn down the thermostat on the cylinder - i hear that "click" 4) boiler
turns OFF

Room one - you mean any room in the flat? well all the room are pretty
cold (since no CH is coming on!)

Ah. I was assuming somewhere in the flat there is a thermostat that sets
the overall temp, and TRVs in the rooms trim that. Commonly in the hallway.
Or have *all* rads got TRVs?

after step 4), then thats it for me - nothing else seems to happen.

why would having room one higher than ambient temp 'force' the motorised
valve to the heating position?

Only if you have a room stat somewhere - which is what your wiring diagram
suggests.

--
*Two many clicks spoil the browse *

Dave Plowman London SW
To e-mail, change noise into sound.