My Circle Zero presents a new symptom, yet again! It cleans. Too well. The scooper arm keeps rotating and never moves on to the next steps. I can stop it by triggering the cat sensor. I think the rotor arm sensor malfunctioned. I wanted to know of I can send it in for repairs. It should still be covered under warranty. If not, then I hope I can get a new sensor or even an entire motherboard assembly.
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Hi @Lambofurgod
It is normal for the scoop to rotate 4 times in total, but if it continues to rotate, there are two reasons;
- The sensor cannot recognize the correct position due to sand or dust trapped in the position sensor under the motor shaft, the scoop continues to rotate.
- It can be caused by poor assembly of the lower mold of the black sandbox and the lower mold of the white cover.
Here is how you can fix this:
- Please reassemble correctly after disassembly. This problem occurs when the coupling between the motor shaft and the motor center rotation shaft is incorrect.
- If it is the same after reassembly, reassemble and clean the sand between the motor shaft and the correct position with a vacuum cleaner or a brush, and then reassemble.
- If the above method does not solve it, please send us a video showing the issue.
Please let us know how it goes.
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I didn’t exactly know what the sensor was supposed to look like the first time I cleaned it. I went in with a narrow pipe cleaner and scraped out the caked in dust from the sensor grooves. Took a second pass with 99.9% isopropyl alcohol to ensure each side was exposed. Used the troubleshooting buttons on the motherboard and BAM! Sensor back in operation. Thank you so much. 
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Great news 