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?