Mechanical boiler timer

[ldewson86]

Hi guys I am after some guidance I have a boiler with a mechanical timer which has a switch in the middle to control off/on/timer. The problem I have is the switch keeps dropping to the off position when I put it in the on or timer position. The heating works fine and the timer does it is just this switch that is causing the problem. Is there any way to repair it or am I best off investing in a new timer?

The boiler i have is a Heat Line Vizo Type C12-C32-C42-C52-C62 if that helps

Thanks in advance