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LED 402 (9)

Branch Box LED 402 blinks 9 times — Remote controller communication error.

Fujitsu · 410A Multi-Zone Mini-Split Systems

What does LED 402 (9) mean?

LED 402 flashes nine times, indicating a communication error with the remote controller.

Common Causes

  • Loose or incorrect wiring for the remote controller.
  • Defective remote controller.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the power to the branch box by cycling the circuit breaker.

  2. 2

    Check the wiring connections between the remote controller and the branch box for any looseness or damage.

  3. 3

    Ensure the remote controller is properly connected and functioning correctly.

  4. 4

    If the error persists, the remote controller may need to be replaced by a professional.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

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Source: Fujitsu 410A Multi-Zone Mini-Split Systems
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