With a bit of luck it is only the fuse which has blown.
It is a 3 amp blade fuse located in the cassette compartment, depending which model toilet you have it will be either, for the C200 on the left hand side as you open the door, or if it is a C2, 3 or 4 bench toilet it will be up under the blade opening mechanism(but in this case the fuse will be a glass fuse).
If it is a C250 it will be at the back behind the cassette on the floor of the compartment.