Waste Drawer Full Indicator Issues

How the Drawer Full Sensor Works

Common Waste Drawer Issues

1. False "Drawer Full" Alerts

The most frustrating issue is when the unit shows drawer full but the bag is barely used.

Common causes:

• Bag not seated properly in the drawer
• Wrong size bag causing sensor obstruction
• Sensor needs cleaning or reset
• Drawer not fully inserted

How to fix:

1. Remove the drawer completely
2. Remove and replace the bag, ensuring it sits flat on the bottom
3. Fold excess bag material outside the drawer (not inside)
4. Reinsert the drawer firmly until you hear it click
5. Press the Reset button on the control panel

2. Indicator Won't Reset After Emptying

Sometimes the "drawer full" indicator stays on even after you've emptied and reset.

How to fix:

• Remove and reinsert the drawer several times to ensure proper seating
• Check the contact points on the drawer and base for debris
• Wipe contact points with a dry cloth
• Power cycle the unit: Unplug for 30 seconds, then plug back in
• Press Reset after the unit completes its startup cycle

3. Drawer Full Light Flashing

A flashing blue light (on LR4) typically means the waste drawer needs attention.

Steps to resolve:

1. Empty the waste drawer even if it doesn't look full
2. Check that the carbon filter is properly installed
3. Ensure the filter cover is snapped into place
4. Press the Reset button

Proper Bag Placement

Incorrect bag placement causes most drawer sensor issues. Follow these tips:

• Use the right size: 9-11 gallon bags work best for most models
• Don't use scented bags: Some cats avoid the litter box if the bag has a strong scent
• Lay flat: The bag should sit flat on the drawer bottom
• Fold the excess: Fold bag handles over the outside of the drawer, not inside
• Don't overfill: Even if the bag has room, overfilling can trigger the sensor

Resetting the Drawer Sensor

For Litter Robot 3:

1. With the drawer in place, press and hold the Reset button for 5 seconds
2. The light should flash, indicating the sensor has been reset

For Litter Robot 4:

1. Open the Whisker app
2. Select your Litter Robot
3. Tap "Reset Drawer" or use the Reset button on the unit