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Burbling Sound

Burbling sound heard from unit - Drain hose air absorption

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Burbling Sound mean?

A 'burbling' or gurgling sound is heard coming from the unit.

Common Causes

  • Outside air being absorbed from the drain hose when a range hood or ventilation fan is turned on, causing water in the drain hose to spout out.
  • Strong outside wind blowing directly into the drain hose.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if a range hood or strong ventilation fan is operating simultaneously, as this can create pressure differences affecting the drain hose.

  2. 2

    Inspect the drain hose for proper installation, ensuring it has a correct slope and is not exposed to strong winds that could cause air to blow in.

  3. 3

    Ensure the drain hose is not obstructed and has a proper trap or seal to prevent air ingress if possible.

Browse all codes in this manual (87)
Verified technical data. Last updated: April 2026

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Source: Mitsubishi Electric MSZ-AP Air Conditioners
Open Manual (Page 17)Search more codes in this manual