Update on problem.
After posting first of all I asked a friend who I used to work with to look at it, as he used to wire all the boilers.
He went round and said it was the programmer so changed programmer and still same problem. Went back today to check all wiring and all seems ok. Wiring is as following:
Live, neutral and earth from spur to programer.
Ch on to wiring centre joined to white of 3 port valve.
Hw on to wiring centre from programer joined onto cylinder stat.
Return on cinder stat connected to live to boiler and Orange on 3 port valve.
Satisfied from cylinder stat joined to grey on 3 port valve. The programmer does not have a Hw off that should be joined also with the grey on 3 port valve. This is not a problem as they have the Hw set on all the time.
All the wiring seems to be ok if the above is correct. But the ch does not seem to switch off even with the programmer turned off.
Tested voltage on Hw on only at Orange of 3 port valve and gives 230v if stat is turned down 230v goes away.
At white of valve reading 230v with Hw on and ch off. Disconnected white at programmer and getting 230v still but nothing on cable to programmer meaning voltage coming from valve side. Is this correct for the valve to bring the white live when Hw is on? Or is it possible its back feeding at valve causing ch to come live?
Sorry for the long reply
Thanks
After posting first of all I asked a friend who I used to work with to look at it, as he used to wire all the boilers.
He went round and said it was the programmer so changed programmer and still same problem. Went back today to check all wiring and all seems ok. Wiring is as following:
Live, neutral and earth from spur to programer.
Ch on to wiring centre joined to white of 3 port valve.
Hw on to wiring centre from programer joined onto cylinder stat.
Return on cinder stat connected to live to boiler and Orange on 3 port valve.
Satisfied from cylinder stat joined to grey on 3 port valve. The programmer does not have a Hw off that should be joined also with the grey on 3 port valve. This is not a problem as they have the Hw set on all the time.
All the wiring seems to be ok if the above is correct. But the ch does not seem to switch off even with the programmer turned off.
Tested voltage on Hw on only at Orange of 3 port valve and gives 230v if stat is turned down 230v goes away.
At white of valve reading 230v with Hw on and ch off. Disconnected white at programmer and getting 230v still but nothing on cable to programmer meaning voltage coming from valve side. Is this correct for the valve to bring the white live when Hw is on? Or is it possible its back feeding at valve causing ch to come live?
Sorry for the long reply
Thanks