help needed HW and CH problems please

[kingfisher1548]

Hi,
Fitted a new 3 port valve at the weekend and thought all was well, but not so.
I cant have the CH and HW on together.
If I turn off the power supply then the valve lever moves to rest at centre left.
Turn power on and then select HW, lever will stay where it is and we get hot water.
Turn off HW and turn on CH the valve lever moves all the way to the right hand side and we get hot rads.
Leave the CH on and turn on the HW and the valve just stays in the same position and the rads stay hot but no hot water.
It's as though the valve wont rest in the mid position to allow CH and HW together.
Any ideas what I could have done wrong.
(Tower valve fitted as a straight replacement for the old and a programmable timer in use).
Hope I haven't confused you all.
Thanks,
Dave

 

[seco services]

your still getting power on the grey wire when ch/hw are called for.

 

[kingfisher1548]

Hello again seco, thought I had all this sorted.
Thanks for your help last time.
Could you please explain more about the grey wire, where should this go?
I haven't got it in the wrong hole again have I?

 

[seco services]

the grey wire will get power from the
programmer hw off.
cyl stat satisfied.

if ch only called for power from the room stat to the white wire on the valve this will move to mid position the grey will then take it over to ch only.

 

[kingfisher1548]

excuse my ignorance seco,
what do I need to do to sort this please.

 

[kevplumb]

Hello again seco, thought I had all this sorted.
Thanks for your help last time.
Could you please explain more about the grey wire, where should this go?
I haven't got it in the wrong hole again have I?

y plan

• kevplumb
• 19 Sep 2009
• 22

if you have your eyes will water

 

[kingfisher1548]

Still not clear what I need to do to remedy this.
Does this mean I'm possibly wired wrongly or is something at fault?

 

[seco services]

check what connection the grey is in.

should be 3 wires

grey
wire from cyl stat satisfied
wire from programmer hw off.

 

[kingfisher1548]

Yea, looks good.
Grey wire connected to yellow from cyl stat and yellow HW off from programmer.
Does this mean something is faulty?

 

[seco services]

would say so.
take the one from programmer hw off out of the grey terminal
turn hw on cyl stat calling then see if the one from programmer hw off is live.