Litter Robot 3- Cat Weight Sensor Issue, I think?

Help & Support Domestic Robots
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I purchased a litter robot 3 secondhand. The seller told me they were having issues with a continuous solid red light plus a few other issues, but it was super cheap, and I was up for the challenge of fixing it!

The seller had already replaced the cat weight sensor.

I dismantled the base and replaced the motor, the DFI sensor, and the pinch sensor. I also took apart, inspected, and reinstalled the cat weight sensor.

The motor and pinch sensor resolved the other issues, but the unit still displays a solid red light. The light illuminates within a minute of pressing the reset button which says the cat weight sensor is still the issue.

I’m wondering how sensitive is the plate. Would screwing/unscrewing the cat weight nut help the situation? I’m only finding “until snug” or “approximately 1/4 inch” as a reference of how far to tighten. Is there something more specific? Or am I bark up the wrong tree?

Edit: I’m suspicious the base got wet as well. The motor seems to be damp. Did the seller fry the motherboard? Should that be my next try?

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Hi @TrayJay and welcome to our forum!

It seems that you already got a lot of knowledge about this robot.

As you already mentioned, adjusting the screw on the cat sensor can help. Try to tighten it a little bit. This should decrease sensitivity.

Also, I would suggest that follow two wires that are connected to the sensor. Maybe these are damaged somewhere?

In the end, if you think the robot was flooded, you are correct: main circuit board is potentially damaged and it should be replaced.

Feel free to ask anything else.

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Check the alignment of the new DFI sensor (the sensor that detects waste levels) is correctly installed and aligned. If misaligned, it could falsely trigger errors.

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If this is the case, there should be blue blinking light error. But yes, in that case also robot would not detect the cat.

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The issue is it’s always detecting a cat. It illuminates solid red almost immediately after it cycles or is turned on

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Hi @TrayJay .

Try to adjust the tightness of the screw on the cat sensor and see what happens.

And if replacing the cat sensor did not help, I would suggest replacing the main circuit board.