CodeRegistry
Brands
  1. Home
  2. MHI
  3. Air Conditioning
  4. Remote control operation failure
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

Remote control operation failure

Remote control operation failure — Unit not responding or abnormal display

MHI · Air Conditioning

What does Remote control operation failure mean?

The remote control fails to operate the unit or shows an abnormal display. This indicates a problem with the remote itself or its communication with the air conditioner.

Common Causes

  • Batteries running down or exhausted.
  • Abnormal condition displayed on the remote control.
  • Obstacles between the remote control and the unit.
  • Remote control signal receiver exposed to direct sunlight or strong lighting.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Replace the batteries in the remote control with new R03 (AAA, Micro) x2 batteries.

  2. 2

    Press the ACL switch on the remote control with the tip of a ballpoint pen to reset the microcomputer.

  3. 3

    Ensure there are no obstructing obstacles between the remote control and the indoor unit's receiver.

  4. 4

    If the issue persists, operate the unit using the temporary ON/OFF button on the main unit and contact your dealer.

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 9)Search more codes in this manual