Litter-Robot 4 What do the lights mean (2024)

Red solid
If your unit’s light bar is solid red, this indicates that the cat sensor has been triggered (kitty entered globe). The unit will cycle once the cycle delay countdown is up or if you press the Resetbutton. Learn more.

Red flashing
If your unit’s light bar is flashing red, this indicates that a cat (or weight) has been detected for over 30 minutes. Learn more.Red momentary flash
If your unit’s light bar briefly flashes red when you press any button, this indicates that the unit is actively in Control Panel Lockout Mode. This mode disables the buttons to prevent accidental changes to the unit. Learn more.Red with flashing white
If your unit’s light bar is red with two flashing white lights, this indicates that the unit cannot detect the Globe position. Learn more.Red with flashing yellow
If your unit's light bar is red with two flashing yellow lights, this indicates the Globe is jammed or overloaded, and the motor will stop. The unit will retract and try to continue cycling. Learn more.Red and green alternating
If your unit’s light bar displays a red and green alternating light bar, this indicates that the unit has lost its factory scale calibration values, and needs to be repaired. Please submit a support request for further assistance.Red and blue alternating
If your unit's light bar is alternating red and blue, this indicates that the three laser sensors, called Curtain Sensors, need to be cleaned. Learn more.

Red ping-pong
If your unit’s light bar has one red light lit going back and forth (also known as "ping-pong"), this indicates that motion was detected in the waste drawer. Learn more.

Light patternPossible causePossible solutionGreen FlashingManual cycle completed successfullyNormal operation, no action requiredGreen
Round RobinNormal operation, no action requiredNormal operation, no action requiredPurple Round RobinNormal operation, no action requiredNormal operation, no action requiredRed / Green
(3 Solid / 2 Flashing)Low system voltageReplace power supplyBlue / Green
(3 Solid / 2 Flashing)Issue with USB devicePower OFF the robot, wait 5s, power ON the robot;
Unplug the USB deviceBlue / Yellow (3 Solid / 2 Flashing)Robot or scale feet are unbalancedMake sure robot is on level ground (not on carpet, a litter mat, power cord, in a grout line, or leaning against wall); Learn moreYellow / Red
(3 Solid / 2 Flashing)Dirty laser 2;
Laser board firmware does not support this featureReference 'Flashing Red Display Code';
Use Whisker app to update the robot's firmwareYellow / Green
(3 Solid / 2 Flashing)User-initiated 4x4 cal modeNormal operation, no action requiredYellow / Blue
(3 Solid / 2 Flashing)User-initiated 4x4 cal modeNormal operation, no action requiredWhite / Blue
(3 Solid / 2 Flashing)Power supply is defectiveReplace power supplyGreen / Purple AlternatingHall effect board disconnectedCheck motor connection;
Contact customer supportBlue / Yellow
AlternatingUser-initiated manual override mode

Normal operation;
Press and hold Cycle key to manually cycle the robot;
To exit this mode, power cycle the robot

Blue / White
AlternatingMotor disconnectedCheck motor connection;
Contact customer supportYellow / Purple AlternatingScale Calibrate or Audit ModePower OFF, wait 5s, power ON the robot

Red Power button

User initiated a hardware reset;
Main board is defective

Normal operation, no action required, allow 5s for robot to reboot;
Unplug power supply from the robot

Blue flashing Power buttonLost power;
Power supply is defective

Plug power supply into robot/wall;
Replace power supply

White Power buttonOTA initiated from user or backendNormal operation, no action requiredWhite flashing Power buttonOTA initiated from user or backendNormal operation, no action requiredWhite Cycle buttonOTA initiated from user or backendNormal operation, no action requiredWhite Cycle + Reset buttonsOTA initiated from user or backendNormal operation, no action requiredWhite Reset buttonOTA initiated from user or backendNormal operation, no action requiredWhite flashing WiFi buttonFirmware errorUpdate firmware; Contact customer supportYellow WiFi buttonUser-enabled Wi-Fi modeNormal operation, no action requiredRed flashing WiFi buttonUnable to connect to router

Verify router is powered up and operational;
Power cycle the robot