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SW900 Error Code

E09 - Controller Fault

Controller reported an internal power-stage fault.

High severityStop

What it means

Main controller electronics are not operating safely.

Common causes

  • MOSFET failure
  • Water damage
  • Short circuit
  • Overload

Symptoms

  • No assist
  • Error always present
  • Burning smell or heat

Suggested fixes

  • Disconnect battery
  • Inspect for water/damage
  • Replace controller
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