Y plan provides hot water when turned off

[John.g]

Something strange there allright, you could remove the wires from the HW ON and HW OFF terminals, then probe both terminals, with HW switched to OFF then there should be 230V on these terminals and 0V on HW ON terminals, with HW switched to ON then 230V on HW ON terminals and 0V on the HW OFF terminals, this should prove the programmer is OK?.

 

[Tom5099]

I will give that a go, do you mean probe the wiring in the control centre on the terminals there
So basically there should be 230v on which ever terminal im asking for
HW on 230v on terminal 6
HW off 230v on terminal 7
If this isn't the case the timers got an issue, if it is the case I'm literally at a dead end

 

[John.g]

You could try it that way but if there is still 23oV at terminal 6 with HW OFF then I would be inclined to probe at the programmer itself with the wire removed from the HW ON terminal, if that switches on/off wirh HW switched on/off then the fault somewhere is.
Here is a schematic of the mid position valve which makes it easier to undersatand, its a very clever device, its shown in the HW position, completely unpowered.

 

[Tom5099]

You could try it that way but if there is still 23oV at terminal 6 with HW OFF then I would be inclined to probe at the programmer itself with the wire removed from the HW ON terminal, if that switches on/off wirh HW switched on/off then the fault somewhere is.
Here is a schematic of the mid position valve which makes it easier to undersatand, its a very clever device, its shown in the HW position, completely unpowered.

John
Thank you for all your help, changed the timer and it's all working perfect
Forum to the rescue again