Timer is off but boiler is still operating!!

[ShaunCorbs]

Follow the port valve wires eg the black ones should lead to a 12-14 way choc block strip or wiring centre

 

[Jurgenjay]

Follow the port valve wires eg the black ones should lead to a 12-14 way choc block strip or wiring centre

Thank you so much Shaun! Very helpful of you!

 

[ShaunCorbs]

That’s a wiring diagram for your system

 

[Jurgenjay]

That’s a wiring diagram for your system

Thank you so much Shaun!!

 

[akkeosflomdis]

Port valve stuck / the micro switch, how capable are you with electrics and do you have a multi meter?

 

[Jurgenjay]

Port valve stuck / the micro switch, how capable are you with electrics and do you have a multi meter?

If it is Port valve stuck---then we can replace it;
If it is the micro switch---how to do with this? And how to check if it is micro switch?