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AIR PURIFYING lamp flash, POWER lamp lighted (MXZ type)

AIR PURIFYING lamp flashes and POWER lamp is lit — MXZ type multi-system operation mode conflict

Mitsubishi Electric · MSZ-FH Air Conditioners

What does AIR PURIFYING lamp flash, POWER lamp lighted (MXZ type) mean?

In an MXZ type multi-system, the outdoor unit operates but the indoor unit does not. This occurs when indoor units are set to different operation modes (e.g., COOL/DRY/FAN vs. HEAT). The unit that started first has priority.

Common Causes

  • Conflicting operation modes selected across multiple indoor units in an MXZ multi-system.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Unify the operation mode across all indoor units (e.g., all set to COOL or all set to HEAT).

  2. 2

    Check the remote controller settings for each indoor unit.

  3. 3

    Turn off power to all indoor units, then turn them back on and set to a unified mode.

  4. 4

    If the problem persists, reset the system by briefly disconnecting power to the outdoor unit.

  5. 5

    Refer to the outdoor unit service manual for MXZ type specific multi-system operation details.

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Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric MSZ-FH Air Conditioners
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