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This is a repair of an old Xiaomi Robot Vacuum that refuses to start as it senses that one of its wheels are suspended (this is sometimes referred to as Error 3) even though both wheels are on flat ground.
This is a problem that can occur due to a broken sensor. Fortunately, the sensor is just a regular micro switch and can be changed with a bit of simple soldering. If you are not able to solder, the alternative is to buy a replacement wheel assembly, which is far more expensive compared to changing just the broken sensor.
In this video, I show you how to disassemble the wheel assembly and get to the micro switch.