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Left lamp blinks 6-time blink 2.5-second OFF

Left lamp blinking six times — Outdoor thermistor issue

Mitsubishi Electric · Air Conditioning

What does Left lamp blinks 6-time blink 2.5-second OFF mean?

The outdoor thermistors have a short or open circuit during compressor operation. The unit will not run.

Common Causes

  • Outdoor thermistor short circuit
  • Outdoor thermistor open circuit
  • Faulty outdoor thermistor wiring

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to 'Check of outdoor thermistor' in the outdoor unit service manual.

  2. 2

    Inspect outdoor thermistor connections.

  3. 3

    Replace faulty outdoor thermistor(s).

Browse all codes in this manual (170)
Verified technical data. Last updated: April 2026

Related Faults

0.5-second ON / 0.5-second OFF blinkUpper lamp blinks 0.5-second ON/OFF - Miswiring or serial signal error00Normal operation - No error codes1 beep during error display mode1 beep during error display mode - Unit has an error (different code)
Source: Mitsubishi Electric Air Conditioning
Open Manual (Page 39)Search more codes in this manual