This system is kind of like owning a fridge in the sense that you want it running in the background to operate properly; but it’s also like a TV in the sense that you want to turn it off at the wall socket if you’re going away for a long weekend.
When you’re going to leave your system unattended for a long period of time, you can switch it off completely and place the bowl cover into the seat. This seals the chamber and will prevent any smells from entering your bathroom. Then you can comfortably turn the system off at the wall socket without worrying about emptying the contents to prevent the smell invading your home while you’re away
DO NOT use the bowl cover during regular use while the ventilation is operating as this will disrupt airflow through your composting chamber