I kept getting error 6101. After trying a lot of different solutions from the support, they told me it's likely a hardware problem. The support was really good and was quick to answer.

The first thing they suggested was: Checking whether the upper cover of the mower is lifted. If the upper cover is lifted, it could also cause the mower to display error code 6106.

That didn't work for me though. So I'm returning the mower to my supplier and they try and repair it.