Vacuflush toilet loosing vacuum

Thanks for your contact - had to remove complete unit as hatch door was not large enough for 2 people to work on the unit. ie: one holding back the spring.
Also we have a central ensuite, so the base station is under the kitchen drawers - so almost qualify now as a contorsionist ! David has successfully installed all new seals however the pump is still coming on albeit every 25 min now.

We are considering installing a switch to isolate the pump to the toilet without effecting water flow to other areas.

Have you got any other ideas ?

Cheers, Denice

There maybe a build up of gunk in the connection tube in the cassette. Push the large plunger in and clean the surface that mates with the new seals. A spray of silicon in here is a good idea as well. Same with the little plunger.
Also a good idea to thoroughly clean and rinse the cassette . I usually use nappy san, flushed through the system and letting it soak for a while.

Some times you can find the cap off a 20 litre chemical drum that fits the Dometic toilet. I am aware that some people have used some silicone to make up a seal, and glad wrap to stop it sticking to the tank. Glad wrap itself can make a temporary seal.

For the information of all those who kindly came to our assistance ....

We eventually located the area where the leak was, however we are not exactly sure which of the items replaced were the cause.. We found the leak in the piping between the suction pipe that protudes into the cassette, and the vacuum pump.

The method we used to pinpoint the leak was quite simple. On the bottom right hand side of the cassette docking station, there is a switch. When this switch is pushed in, the vacuum pump operates. Whilst keeping the switch pushed in, I held my finger on the hole located on the bottom of the suction pipe (mentioned in paragraph 1) the pump switches off. When this occurs we are holding a vacuum in the small section of piping. If there is a leak in this piping, the pump will switch off and on intermittantly, as quickly as the vacuum is leaking. (as ours did) If there is no leak, it will continue to hold the vacuum.

We replaced the O rings in this section and we also turned over one of the white rubbers, located in the housing that the pump attaches to.

So unfortunately we don't know which of the above was the culprit. All the O rings looked ok, however the white rubber that we turned over had a mark on it - so it could have been this.

Over a 24 hr period we are still holding a vacuum without having the pump come on.

We'd like to thank everybody for their imput. It is great to be associated with a club where assistance is forthcoming so readily when help is needed.

Kind regards,

David & Denice