Hi Jane
There are 3 things that stop the fabric conditioner.
You have correctly identified that it could be a blockage.
2. One of the cold water inlet solenoid valves may be open circuit. This can be tested with a multimeter.
3. The plastic mechanical diverter on top of the soap dispensere may have become unlinked. This can be checked by turning off the power for safety reasons then removing the top cover of the washing machine and inspecting the movement of the plastic diverters on the soap dish.
Hope this helps.
TALBERT
October 2006