CodeRegistry
Brands
  1. Home
  2. Mitsubishi Electric
  3. Air Conditioning
  4. Upper lamp blinks 6-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.

Upper lamp blinks 6-time blink 2.5-second OFF

Upper lamp blinking six times — Outdoor thermistor issue

Mitsubishi Electric · Air Conditioning

What does Upper 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 38)Search more codes in this manual