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If your dometic toilet does not flush (despite the pump being on and having water in the tank!) and the lights do not show on the display when the cassette is removed or full; it could be the fuse.
The fuse(orange)is under the the round bit where indicators which light up are,.eg full etc. You need to prise it out gently with a very flat screwdriver or knife on outer edge. It is kept in place by two spring clips. see photo. It may seem it doesn’t want to come but persevere gently.
-Lin Powell
The leads at back were quite short so I couldn’t pull out far.
The fuse is on the back.
