brttony 100 combi

[davejones]

problem is when i turn on the hw tap the boiler does not fire up and also
same with heating, the pump is running but fan is not if i pull off the tube on the aps and suck slightly the boiler fires up, i checked and changed one of the flow switches the other is ok but still the same. any ideas.

 

[adlplumbing]

then its fualty air pressure switch or blocked venturie

 

[sourcebranch]

Have you got power to the fan??