There is a bad smell coming from the dishwasher
1.
This can be caused by using the dishwasher at a low wash temperature for a prolonged period of time. Try using a high temperature wash programme at least once a month (E.g. P2 – Intensive 65ºC).
For more information see the Dishwasher programmes topic.
2.
Check the dishwasher door seals for old food residue.