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Upper lamp blinks 6 times

Upper lamp blinks 6 times — Outdoor Thermistors Error

Mitsubishi Electric · MSZ-AP Air Conditioners

What does Upper lamp blinks 6 times mean?

The indoor unit's upper lamp blinks six times, indicating an issue with the outdoor unit's thermistors. The outdoor thermistors are detected as short-circuited or open-circuited during compressor operation.

Common Causes

  • Outdoor thermistor is short-circuited
  • Outdoor thermistor is open-circuited

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the air conditioner at the main power supply breaker.

  2. 2

    Wait for at least 30 seconds, then turn the main power supply back on.

  3. 3

    Ensure the outdoor unit is clear of debris or blockages that might interfere with sensor operation or lead to overheating.

  4. 4

    If the error reappears, contact a qualified service technician, as outdoor thermistor inspection and replacement require specialized tools.

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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