The seal on the water container has not been lubricated regularly.
Lightly grease the O-ring on the coupling valve of the water container with silicone grease as described in the operating instructions.
The water container has become harder to put into the steam oven/combination steam oven and take out again.
Lightly grease the O-ring on the coupling valve of the water container with silicone grease as described in the operating instructions.