Y plan with 2 port twisting my melons man

[RichardMoore]

The hot water 2 port needs to open first when the clock is on then that will fire the boiler

with the overheat in-between these of course[/QUOTE

Do you mean the cylinder stat in between as if it fails the two port will not open and thus no hot water, safety cut off

 

[stidge]

Cheers Richard will try and find it now thanks again

 

[Justin2211]

with the overheat in-between these of course[/QUOTE

Do you mean the cylinder stat in between as if it fails the two port will not open and thus no hot water, safety cut off

No I mean safety overheat its a secondary stat basically if the cylinder stat fail this will then trip on over heat shutting the valve stopping the cylinder becoming a bomb
This is to stop if for instance the cylinder stat got jammed to call the over heat would trip shutting the valve if that makes sense lol

 

[stidge]

Update- been this morning, added HW off from programmer to wiring centre ! All works fine now with dual stat shutting off 2 port when up to temperature...many thanks to Justin and Richard