This guide explains how to troubleshoot if the face display of the ugo Pro (G4) does not show correctly.
◆Table of Contents
・STEP 1: Check if it stays on the rainbow circle for a long time without changing
・STEP 2: Check cable connections
・STEP 3: Check for other causes
・If the issue still does not improve
◆Diagnostic Flow
◆STEP 1: Check if it stays on the rainbow circle for a long time without changing
If after powering on, the face display remains on the rainbow circle image for a long time (including after startup completion) without changing, there may be a loose internal cable connection.
- If it stays on the rainbow circle without changing → Proceed to "STEP 2: Check cable connections"
- If there is a different display issue (freeze, completely dark, no change from default face, etc.) → Proceed to "STEP 3: Check for other causes"
◆STEP 2: Check cable connections
If the power is on but the face display remains showing the rainbow circle without changing for a long time, it may be caused by a loose internal cable connection.
【Please Check the Following】
① Turn off the main power button of the unit and also turn off the main power switch (only for models manufactured from March 2025 onward).
② Press and release the emergency stop switch, and confirm that the emergency stop state is completely cleared.
③ Unplug and replug all cables connecting the body unit and the lifter unit, and confirm they are securely connected. Please do not rely only on visual confirmation; physically unplug and replug each cable. Especially check that the Ethernet cable plugged into the body unit is fully inserted and not partially connected.
| Manufacture Date: From October 2025 | Manufacture Date: Before September 2025 |
④ Unplug and replug all cables (those with tags) connecting the lifter unit and the cart unit, and confirm they are securely connected. Please do not rely only on visual confirmation; physically unplug and replug each cable.
| Cables at the front of the cart unit | Cables on the side of the cart unit |
⑤ After completing steps up to ④, turn on the main power switch and then the power button to start up the ugo Pro.
◆STEP 3: Check for other causes
① Confirm the emergency stop button is not pressed
- Press and release the emergency stop switch, and confirm that the emergency stop state is completely cleared.
② Restart the face display service
- If step ① does not apply, try restarting the face display service. → How to Restart the Service
③ Restart the system (power cycle)
- If step ② does not resolve the issue, try restarting the system (either remotely or by turning the power button off and on). → System Restart (Remotely Restart ugo)
◆If the issue still does not improve
If the issue persists or if you have any other questions, please contact us at the following.
ugo Technical Support Team
✉️ cs@ugo.plus