Conditioner is not used in the wash cycle

I had the same problem with my Bosch Classixx 1200 Express.
It was fixed today & I now know what to do in the future if it happens. The water gets into the soap/ conditioner dispenser drawer via 2 pipes. One points to the main detergent compartment and the other to the pre-wash and conditioner compartments. The pipes become clogged with a type of mould. This meant that in my machine the water was bypassing the conditioner. I had already removed the drawer and cleaned it up and cleaned the jets above with an old tootbrush but it hadn't solved the problem. The repair guy used a cable tie (one of those that is quite firm & will lock) and pushed it up inside the bigger jets. This loosened the black gunge. Then ran water thru from start of the basic cycles and all is now OK