The fabric conditioner section of my washing machine has stopped emptying 
Powder is still disappearing, but not conditioner.
I've had the drawer out, cleaned it and the inside of the machine where the drawer goes, no obvious blockages.
I've also run it with and without conditioner, so I know there is definitely new water going in each cycle.
It's about three years old if that's relevant.
Please offer me wisdom? I'm not enjoying crunchy pyjamas...