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E36 / Outdoor Red LED 1 flash

Error E36 / Outdoor Red LED Flashes Once — Abnormally high discharge temperature

Mitsubishi Heavy Industries · Air Conditioners

What does E36 / Outdoor Red LED 1 flash mean?

Error E36, shown by a single flash of the outdoor unit's red LED, indicates an abnormally high discharge temperature. This can be caused by insufficient refrigerant or a defective compressor discharge temperature sensor (ThOD).

Common Causes

  • The discharge temperature is abnormally high
  • Insufficient refrigerant
  • Compressor discharge temperature sensor (ThOD) defective

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the air conditioner's power supply.

  2. 2

    Ensure the outdoor unit has good airflow and is not obstructed by debris or nearby objects.

  3. 3

    Clean the outdoor unit's coil if it appears dirty or blocked.

  4. 4

    This error often points to refrigerant issues or a faulty sensor that requires professional attention.

  5. 5

    Contact a qualified technician to check refrigerant levels and the compressor discharge temperature sensor.

Browse all codes in this manual (110)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Heavy Industries Air Conditioners
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