how to ignite voker pilot light?

On modern boilers - when there's a call for heat the fan runs.

A pressure switch senses that the fan is running and that the case is correctly fitted.

The control board opens the pilot flame gas valve and makes sparks to light the flame.

If the pilot flame makes enough heat the control board opens the main gas valve.

Can you hear the fan running?

Good Luck...
September 2015

Manual here.

Find correct one for your boiler.

http://www.vokera.co.uk/trade-professionals/manuals-literature/

Anon
September 2015