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6

OPERATION INDICATOR lamp blinks 6 times (Pattern A) - Abnormal temperature of heatsink

MHI · Air Conditioning

What does 6 mean?

The OPERATION INDICATOR lamp blinks six times in 'Output pattern A' from the indoor unit, indicating an abnormal temperature of the heatsink in the outdoor unit.

Common Causes

  • Abnormal heatsink temperature.
  • Poor airflow around the outdoor unit.
  • Faulty outdoor fan motor.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if indoor/outdoor units have a short cycle on their air ducts, affecting heatsink cooling.

  2. 2

    Measure the resistance value of the outdoor thermistor (TH8) to confirm its proper operation.

  3. 3

    Inspect the outdoor fan motor for correct operation and ensure it is not obstructed.

  4. 4

    Ensure the connector (TH3) on the outdoor controller board is not disconnected.

Browse all codes in this manual (124)
Verified technical data. Last updated: April 2026

Related Faults

00Outdoor Board LED only green lights up after startup - No outdoor unit of address 0 / Remote controller transmission wire open1OPERATION INDICATOR lamp blinks 1 time (Pattern A) - Indoor/outdoor unit communication error (Transmitting error - Outdoor unit)14OPERATION INDICATOR lamp blinks 14 times (Pattern A) - Other errors
Source: MHI Air Conditioning
Open Manual (Page 23)Search more codes in this manual