u/BURN-C

Hi, our S3 has the following issue. Has anyone experienced this before?

🔴 Issues:

• Error codes 6, 17, and 20 permanently displayed – immediately after startup, even while stationary
• No motor assistance, no Boost
• No speed detection (always 0 km/h in the app)
• No lights
• Bell and all system sounds are very quiet, but they still work
• Reset and battery restart make no difference

✅ Initially still working:

• Bluetooth
• App connection
• Firmware displayed correctly
• Battery charge level displayed correctly
• Kick Lock movement detection
• Alarm (but very quiet)
• Charging shown correctly in the app, but the charger LED alternates between green and red

Troubleshooting already performed:

• Replaced the main battery with another original battery → bike worked perfectly for 2–3 hours
• After unlocking the bike, error codes 6, 17, and 20 suddenly returned along with the other symptoms
• Previous battery showed the exact same errors and, about 2 weeks later, could no longer be charged; the bike then became completely unresponsive

Current situation with the second battery:

• After two days, the bike became completely dead again
• Won't charge, won't start, won't connect to the app
• Initially, when the charger was connected, the alarm would sound quietly and the skull icon appeared on the display

Possible causes (according to ChatGPT):

• Smart Cartridge (internal power supply / communication path): 55% probability
• Power Board (ECU / central ride power supply): 45% probability