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when I press button on relay module ( receiver for room stat ) ( HC60NG ) when CH is being demanded from CH programmer the actuator clicks - but nothing else does this indicate faulty actuator / microswitch - I have dismantled and all looks good - motor moves smoothly - all connections...

yes, thanks for that. Easier said than done when you have 4 interacting components - two wireless in 3 different rooms - and when you don't know what you are doing - which is why I am here!!!

it's cold here!! Summary: Boiler seems ok - supplies hot water for HW storage cylinder. No response ( from boiler ) to demands for CH 3 way Valve seemed to be sticking so replaced - when I removed old valve it was very stiff - could not move ( with just fingers ) to or beyond...

it has a button when pressed it demands CH from system However - the system only "fires" for a few seconds ( pump/ actuator) then shuts down...

so - only having power to grey if CH & HW off is ok As I discovered - white ( B&W) powers on when stat demands ?

it's a wireless stat "Honeywell Wireless Room Thermostat Y6630D Stat"

as stated before - white ( actually from my actuator it is a black and white wire ) is NOT powered until room stat works..

FOrgive my ignorance - not sure what you mean here. Do you mean in the junction terminal box link orange to grey? grey to neutral? I'm guessing!!

** yes - as long as room stat is activated ( red light on) the valve and pump turn on

sigh system seems to tire of my meddling and shut itself off after too many button presses!! for a while I had voltage at both grey and orange wires state 1: grey 240, white ( B&W ) 0, orange 0 state 2; grey 170, white 0, orange 240 state 3; short bursts of 240 on white when room...

SO - summary!? Programmer is live, sending HW and CH demans o tank and or room thermostat. room thermostat is sending signal to boiler, valve and motor ( or however the chain of command is ) - thunderbirds are go..... then not! If we assume ( for now ) that actuator, valve and pump are...

""when CH demanded first valve has to move to CH ( and or HW + CH ) position, and this then mechanically triggers a micro switch to tell boiler to refer to room stat and decide to turn on boiler!! ? Read more: //www.diynot.com/forums/viewtopic.php?p=2905485#2905485#ixzz2hX4xefGr""...

ok - Not tested yet - still working through the logic. Neither the valve nor the boiler respond to CH demand I can force system to give me CH ( rads warm until HW storage stat turns off boiler. ) if I move valve lever manually to HW+CH ok - thinking on " out loud! " when CH...

** Old valve was very stiff - could only just move it with pliers - New valve fitted move easily with just fingers ** thanks for detailed reply / trouble shooting guide!

Just replaced honfoss actuator and valve . Still no ch when demanded. Valve on manual and hw demanded I get ch until hw thermostat stops. Why cant I get ch? I am assuming replacement valve ....fiver off ebay ... New... Is working!!!?

Yes it is the 3 port Danfoss definitely has power ( getting hot - some noises !) I can move valve via the manual lever ( so can ask on control panel for hot water then divert to rads via lever on the Danfoss box! ) so valve not too stiff - but will investigate further... they are on...

ok pump fine its the Danfoss motorised pump - 3 way - wont switch to CH? fix or replace?

"tested pump " as per "spinning the pump " faq I think - not sure I found the right FAQ Tony... water dribbles out when centre "bleed screw " removed - inserting smaller screwdriver and impeller moves freely... Pressing button on Honeywell control(?) box next to pump causes impeller to spin...

iDEAL CONDENSING BOILER NEW ( 2010 ) ( ICOS HE15 ) NEW wILO pump fitted last year ( was noisey for a while ( cavitation - vented system ) ) so - hot water fine when demand for CH = nothing - fault code H6 ( not in manual... ) thermostat seems fine ( lights up... ) pump leaks...