My central heating pump will not switch off

[Joniroscoe]

When the timer goes off the pump is still running, any ideas?

 

[albatross]

Pump over run, normal function on modern boilers usually for a few minutes. May be faulty if it never stops.

 

[Joniroscoe]

There's a switch on the wall that I can turn off, this also turns the auto heating & water timer off