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Oh the fun I've had with our electric flush!

As said the fuse can be a problem. On ours the screw on cap cracked, only a bit so you couldn't tell until you removed the whole fuse carrier. But it was enough to make intermittent contact so sometimes it worked & sometimes didn't. It's a daft place to get at as well - I ended up taking the whole thing out before I could really see why it was causing a problem.

The other problem is with the microswitches. There's one that disconnects the flush when the cassette is removed - if that sticks then you get problems. The weird thing I found was that with a circuit tester all was fine, but it just didn't work. I just took the microswitch out and joined the wires together. So long as you remember not to flush it when the cassette is out then there's no problem.

The other microswitch is on the rod that you press down to flush - again a dodgy contact there is possible.

hi there we had a very similar problem in our lunar sunbeam

the 2 power wires which power the pump had been connected with scotch lock which were giving an intermittant fault

try and follow the wiring from the toilet to the point it is joined to a 12v power feed and see how its connected.

i had the misses hold the flush on while i messed and moved the wiring and thats how we came accross our fault

good luck with it

may help

http://www.thetford-europe.com/web/show/id=26111/langid=42