CodeRegistry
Brands
  1. Home
  2. Mitsubishi Electric
  3. Air Conditioning
  4. Left lamp blinks 5-time blink 2.5-second OFF
About·Privacy·Terms

CodeRegistry — Your global library for technical solutions.

For your safety: always follow the equipment manufacturer’s official manuals. CodeRegistry is an independent help site and is not affiliated with the brands listed here.

Left lamp blinks 5-time blink 2.5-second OFF

Left lamp blinking five times — Outdoor power system fault

Mitsubishi Electric · Air Conditioning

What does Left lamp blinks 5-time blink 2.5-second OFF mean?

This occurs if the compressor stops due to overcurrent or startup failure protection three times within one minute of startup. The unit will not operate.

Common Causes

  • Compressor overcurrent protection triggered
  • Compressor startup failure protection triggered
  • Faulty outdoor power system component

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Refer to 'How to check of inverter/compressor' in the outdoor unit service manual.

  2. 2

    Check the stop valve.

  3. 3

    Ensure proper ventilation for the outdoor unit.

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