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lock icon

Lock icon displayed — Child Lock function is active

MHI · Air Conditioning

What does lock icon mean?

When the Child Lock function is set, the lock icon is displayed on the remote control. This prevents accidental operation changes, allowing only the ON/OFF button to function.

Common Causes

  • Child Lock function has been activated on the remote control.
  • Prevents unintended changes to temperature, fan speed, or airflow direction.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    To release Child Lock, press the SET button on the remote control for 3 seconds or more.

  2. 2

    Verify the lock icon disappears from the display.

  3. 3

    After unlocking, you can change other settings as needed.

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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