Hi Smiley, If the fuses are fine, the pump has been replaced, then the problem will probably one of the two switches within the body of the toilet, or on a couple of occasions i have found a bad contact in the cable joint under the toilet body, you can find the location of these parts on the Thetford website, but the first thing you need to check is that your getting 12volt to the toilet!!It was a new water pump fitted on the weekend.
We are at a loss.