Originally Posted by DABurleigh
I can think of many things but none can be relevant as there is no link with the van heater, which is only when your problem occurs
It was not only then - but heating the van amplified the smell. The ALDE radiator tube is close to the toilet so perhaps the contents of the macerator pump got heated.
I'm glad vinegar seem to have helped.
My boat owning friend thinks these toilets need a service each year or two. Changing rubber seals etc. But mine never had one.