Onboard water tank pump ok, fuse ok! then it has to be the Electric valve in the toilet.
Go to Thetford and down load the free pdf's select c200 series then C200 cs then down load the pdfs.
And if you know how to, then save to dvd. I've not tried yet waiting for my son to do it for me he's the computer buff the complex workings of computers go straight over my head, Lunar owner.
Bob, April 2010