Toilet cassette "full" light stays on.

Remus
Remus Forum Participant Posts: 132
edited September 2014 in Caravans #1

The toilet in our Lunar Clubman SE is a Thetford C-250. On a recent trip the "Full" light came on and stayed on.  The cassette was not full and the light stayed on even when the cassette was removed.  Any ideas as to the cause?   The fuse in the cassette
compartment seems ok.  Sometimes I notice that there has been a small amount of leakage through the seal between the bowl and cassette (I'll be getting the seal replaced asap).  Could this have caused a short-circuit?  All advice gratefully received.