If the toilet has been stood over the winter, the pump may just be stuck. If it's a C2, then it's under the toilet roll holder, turn it upside down and try spinning the impellor. If it's a C402 then it is under the control panel. If this is OK then the 402 control panel will probably need replacing. On the C2 it could be a micro switch. Don't forget there is a 3 year warranty on the toilets.
John
February 2009