Robot vacuums are smart, but their error codes can be confusing. A "red light" or "4 beeps" can sometimes mean a jammed brush, a dirty sensor, or a dying battery.
However, there is one secret diagnostic method that technicians use before they even look at the error code: They watch how the robot moves immediately after you press "Start."
The robot's physical movement is the best clue to distinguish between a Power Issue (Heart Failure) and a Logic Issue (Hallucination).
Scenario A: The "Sudden Death"
The Behavior: You press start. The robot attempts to move forward. Within 1-3 seconds, it simply stops dead, shuts down, or reboots. It does not try to back up or turn.
The Translation: "I want to work, but I fainted."
Why this happens: This is a classic case of Voltage Collapse. The robot's motherboard sends a signal to move forward. The motors draw a large current. An aging battery cannot supply this surge, so the voltage crashes, and the system cuts power to protect itself.
The Fix: No amount of cleaning will fix this. You need to replace the battery.
Scenario B: The "Paranoid Retreat"
The Behavior: You press start. The robot immediately moves backward, or spins frantically in a circle, and then stops with an error code.
The Translation: "I think I hit a wall (even though I didn't)!" or "I think I'm trapped!"
Why this happens: This is a Sensor Logic Error. The battery has plenty of power to drive the motors (which is why it has the energy to back up or spin). However, a sensor is feeding the brain false information.
For example, if a Bumper Sensor is broken or blocked by internal dust, it tells the motherboard: "We are crashing into a wall!" The robot's logic dictates that it must reverse to escape the obstacle. When it reverses and the signal doesn't change, it gives up and errors out.
How to Fix "Scenario B" (Sensor Issues)
If your robot is moving backwards or spinning:
- The "Massage" Method: If it's a bumper error (often 2 beeps), briskly tap the front bumper on all sides. This can dislodge dust blocking the internal infrared switches.
- Compressed Air: Blow air into the gap between the bumper and the robot body, or into the wheel housings.
- Check Connections: If you are comfortable with tools, open the bottom cover. Sometimes, the vibration from cleaning can cause the small wire plug connecting the bumper sensor to the motherboard to come loose. A simple "unplug and re-plug" can fix it instantly.
Summary: Read the Movement
- Starts Forward -> Dies Instantly = 🔋 Battery Issue. (Replace Battery)
- Starts Backward/Spinning -> Stops = 👁️ Sensor Issue. (Clean/Repair Sensors)
If your diagnosis points to a battery problem, don't worry. It is the easiest part to replace and will restore your robot to full power instantly.
