Help, my PortaPoti doesn't flush anymore. It is a cassette system, and once some carelessness meant that the cassette overflowed and it got a bit smelly, so a few months ago, I hosed it all out to freshen it up. Since then, when you press the flush button (twist to open, push to flush) it doesn't work. It is all very inaccessible, I managed to check that there was 12 volts on the connectors. I can hear the micro switch operating, and I checked there is pressure from the pumped water. I assume the system just electronically opens a valve. Anyway, it looks so inaccesible, it looks the only way would to strip the whole toilet out. Has anyone had a similar problem? Is the resolution to take it to a specialist? The van is 14 years old.