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RUN light quick blink

RUN light blinks quickly — Invalid operation mode

MHI · Air Conditioning

What does RUN light quick blink mean?

The green RUN light on the indoor unit will blink quickly. This indicates that an invalid operation mode has been selected.

Common Causes

  • Attempting to operate in a mode that is not available or supported.
  • Attempting to run multiple indoor units in different incompatible modes (e.g., one cool, one heat).
  • Remote control or unit setting error.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check the selected operation mode (Cool, Heat, Dry, Fan) on the remote control.

  2. 2

    If using multiple indoor units, ensure all units are set to compatible operation modes.

  3. 3

    Try restarting the unit by turning it off and on again using the remote control.

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
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