look here for repairs.check fuses first.which model is it?if the pump has stuck it will blow the fuse straight away.if you think the pump may be stuck try a good soak in milton overnight and change fuse.if you can get at the pump you can sometimes get the pump moving with a tiny screwdriver on the impeller.
oxter--the two aa batteries are to run the tank full warning not the pump which runs from the van battery. If it is the bench type, you can get at the fuse by lifting out the toilet roll holder.
Brian
------------- there are 10 types of people in this world, those who understand binary and those who don't.
The fuse for the casete toilet is a blade type at the rear of the compartment. Mine went off and I found that the blades of the fuse had corroded. New fuse fixed it.