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All 5 LEDs Lit

All Branch Box LEDs are lit — Connected combination error.

Fujitsu · 410A Multi-Zone Mini-Split Systems

What does All 5 LEDs Lit mean?

All five LEDs on the branch box are illuminated, indicating an error related to the combination of connected indoor and outdoor units.

Common Causes

  • Incorrect configuration or incompatibility of connected indoor/outdoor units.
  • Improper wiring of the units to the branch box.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Reset the power to the branch box by turning it off at the circuit breaker, waiting 30 seconds, then turning it back on.

  2. 2

    Verify that all connected indoor and outdoor units are compatible with the specific branch box model.

  3. 3

    Consult the system's installation manual to confirm the correct combination and configuration of units.

  4. 4

    If the issue persists, professional service is required to check the system setup.

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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