Boiler ignoring the programmer

[willsmam]

Hello
I have an oil fired Worcester regular boiler which suddenly has a mind of its own. Programmer totally off but the boiler is firing up. I’ve noticed that the valve doesn’t move when I turn on the programmer and click the thermostat to on. Should it? The DHW valve doesn’t have a visible switch so I’m talking about the heating one. Always had a problem that can’t just have had water as the radiators always come on too even if thermostat is down

 

[Timmy D]

Wiring/jammed zone valve.

 

[Murdoch]

What happens when you turn off the supply to the boiler / controller?

 

[ShaunCorbs]

In the picture is the lever loose or stiff when you move it ?

 

[willsmam]

What happens when you turn off the supply to the boiler / controller?

The boiler turns off. Then when
I turn the programmer back on to run
Program it comes off and on when it fancies

 

[willsmam]

In the picture is the lever loose or stiff when you move it ?

I can slide it to the on position but it slides itself straight back to off (even though heating is on). I can hear it whirr when I turn thermostat to on but it doesn’t move