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strange noise

Strange noise heard during operation — Mechanical or internal fault, contact dealer

MHI · Air Conditioning

What does strange noise mean?

If the air conditioner emits unusual or strange noises during operation (e.g., grinding, rattling, clunking, or hissing sounds not related to normal refrigerant flow), it could indicate a mechanical or internal fault.

Common Causes

  • Loose components inside the unit.
  • Motor or fan bearing issue.
  • Refrigerant line obstruction or leak.
  • Compressor malfunction.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the air conditioner immediately to prevent further damage.

  2. 2

    Listen carefully to try and pinpoint the location of the noise.

  3. 3

    Contact your dealer or a qualified service technician for inspection.

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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