Unitree Go2 won't stand up after power-on (slow red flash)

Applies to: Go2 · updated 2026-07-06

⚠ Power the robot off and disconnect charging before any physical inspection. Opening a machine can void its warranty — check yours first.

The symptom

You power the Go2 on, it never stands, and the head light slow-flashes red. Per the official manual’s LED table, slow red = system abnormality, boot failure, or hardware failure — and boot failure is by far the most common and most fixable of the three.

The fix, in order

  1. Check the starting position. The manual is strict about this: the Go2 must boot lying flat on its belly with the lower legs fully retracted and all four upper joints and feet touching the ground. Booting from a sprawled, tilted, or half-folded position is the classic cause of a failed stand.
  2. Reposition and reboot. Fold the legs properly, place the robot on firm level ground, and power-cycle (short press, then long press on the battery).
  3. Watch the LED. Flashing green = booting normally; solid green = powered and healthy. If you’re back to slow red after a correct-position reboot, stop.
  4. If it still fails: the manual’s own escalation is that a persistent slow red flash after correct repositioning indicates a system or hardware fault — contact Unitree after-sales (support@unitree.cc) or your dealer. Don’t start disassembling: unauthorized opening voids Unitree’s warranty.

A fast red flash is a different failure — motor/IMU calibration failed — and a slow yellow flash just means low battery (the robot will auto-crouch within ~10 minutes). Don’t treat every red light as the same problem; the blink rate is the diagnosis.