In that case... Somewhere in the pipe ( usually right at the point it joins the pav ) or in the pan its self, there must be a blockage... proly a build up of calcium ( fur )
its either midcro switch or a presurised system unlikley to be both
I've never come across one like that. Had a caravan and 3 Motorehomes with Thetford loos not had that feature in any of them.To prevent accidents when the cassette is removed, a microswitch/reed switch isolates power to the solenoid
What's wrong with using a spray bottle?We now need to solve this properly as a gallon bottle of water in the toilet to flush really does not cut it.