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Refrigerant leakage

Refrigerant leakage found — Gas leak detected

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Refrigerant leakage mean?

There is evidence of refrigerant leaking from the system. This can be indicated by a hissing sound, unusual smells, or visible oily residue near connections, leading to reduced cooling performance.

Common Causes

  • Damaged refrigerant lines or coils
  • Loose connections or worn seals
  • System component failure (e.g., evaporator, condenser)
  • Manufacturing defect

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Stop using the air conditioner immediately.

  2. 2

    Open windows to ventilate the room if the leak is indoors.

  3. 3

    Do not attempt to operate the unit as this can worsen the problem.

  4. 4

    Consult your dealer or a qualified service technician immediately for repair, as refrigerant leaks can affect performance and potentially health.

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

Related Faults

3 Min Restart DelayUnit cannot be operated for about 3 minutes after restart - Microprocessor protection3 Short Beeps3 short beeps from indoor unit - Weekly timer setting failedAP Mode activatedNET and MODE LEDs flashing (every 5 seconds) - Access Point Mode activated
Source: Mitsubishi Electric MSZ-AP Air Conditioners
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