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LED 402 blinks 2 times

Branch Box LED 402 blinks 2 times — Secondary unit 2 identifying display.

Fujitsu · 410A Multi-Zone Mini-Split Systems

What does LED 402 blinks 2 times mean?

LED 402 flashes twice, indicating the branch box is functioning as secondary unit 2 in a multi-unit setup. This is a normal status.

Common Causes

  • N/A (This is a normal operating status).

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    No action needed; this indicates a normal operating status for a secondary branch box.

  2. 2

    Confirm that this branch box is indeed intended to be Secondary Unit 2 in your system's configuration.

  3. 3

    If other issues are present, consult other diagnostic steps for the specific problem.

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Verified technical data. Last updated: April 2026

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