Toilet won’t flush

Afternoon,
Can anyone please Help me
The toilet in my 1994 autosleeper  Duetto has decided to stop flushing
It always used to but suddenly has decided to stop.

Any ideas as to why and how to fix 
Would be Enormously Helpful.
Cheers Heather..

Fuse , up above cassette, accessible from outside looking up top left through cassette door or motor stuck, pretty sure there are YouTube videos showing how to access.

To my rescue again
What a lovely Man You are x
I will have a look and try to find the Fuse to start with.
And then have look on YouTube if I can’t find it 
Thank you Heather

If you are really stuck, use  the shower head to clean the pan.  Keith

I had same problem last week with my Nuevo Thetford toilet - pump working, (audibly) but no water flushing around bowl. Worked out that it was a build up of algae in the flush tank - (blocking the flush pipes)...caused by using a pink flush additive|(!) I had noticed some black bits swilling round the bowl previously, but after emptying the flush tank and putting in a 10:1 (water : bleach) solution, leaving it overnight, and then emptying the  flush tank via the drain plug (see Thetford website), it cleared things - am only going to use plain water from now on! Hope this helps.
...... By the way Thetford recommend trying to keep bleach solution out of the cassette "dump" tank (below the bowl.)