hot water won't turn off

[Bradley31]

I have taken the fronts off all the controls but the Lee is still 240v on the orange and the grey cables and when I turn the far right switch on or off this turns the hot water on and off without any controls. Is there a wire I need to move etc?? I have tried it with the MV head from the heating valve and re wired it but it does exactly the same thing so can’t be the head as the Heating head works fine when it’s on the Heating.

 

[John.g]

Have you checked the wiring at the ST9400A controller in case there is a extra permanent live connected by mistake to the "HW Off" which is used for a Y plan configuration or something along those lines.

 

[ShaunCorbs]

You have a bad port valve or one permanently calling do you have any voltage on the browns on the port valve wires ?

 

[Bradley31]

Need to test no point in throwing parts at it

i have taken the program unit and the HG60 module off. The power is on. you should make out the numbers behind the wires. with the black wire on the tester in space 3, I have 240v in lines 1, 7, 8 and 0. The HW is on and won’t switch off. Even though the controls are removed.

 

[Bradley31]

Have you checked the wiring at the ST9400A controller in case there is a extra permanent live connected by mistake to the "HW Off" which is used for a Y plan configuration or something along those lines.

I notice that this is not how it says it should be wired on the back of the program box

 

[ShaunCorbs]

240v on either 6 or 8?

 

[ShaunCorbs]

It’s s plan so programmer is correct

 

[Bradley31]

240v on either 6 or 8?

Yes, always On 8

 

[ShaunCorbs]

Turn the fused spur off and remove the grey wire and make safe (when you turn power back on this might be live)

 

[Bradley31]

Turn the fused spur off and remove the grey wire and make safe (when you turn power back on this might be live)

Ok, done that. Now there is only 240v to 1 and 7. The HW didn’t come and the MV didn’t move