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POWER lamp solid (outdoor unit not operating)

POWER lamp solid — Outdoor control system data read error (Outdoor unit not operating)

Mitsubishi Electric · MSZ-FH Air Conditioners

What does POWER lamp solid (outdoor unit not operating) mean?

The POWER lamp lights up solid, and the outdoor unit does not operate. This indicates a problem reading data from the nonvolatile memory of the inverter P.C. board or the outdoor electronic control P.C. board.

Common Causes

  • Problem with the nonvolatile memory on the inverter P.C. board.
  • Problem with the nonvolatile memory on the outdoor electronic control P.C. board.
  • Defective inverter P.C. board or outdoor electronic control P.C. board.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn OFF the main power supply to the air conditioner, wait 30 seconds, then turn it back ON.

  2. 2

    Attempt to restart the unit using the remote controller.

  3. 3

    Ensure the outdoor unit is free of debris and has proper ventilation.

  4. 4

    If the error persists, contact a qualified service technician. They may need to check the blinking pattern of LEDs on the outdoor control boards.

  5. 5

    Refer to the outdoor unit service manual for further troubleshooting.

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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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