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EE

OPERATION INDICATOR lamp blinks 7 times (Pattern B) - Communication error between indoor and outdoor units

MHI · Air Conditioning

What does EE mean?

The OPERATION INDICATOR lamp blinks seven times in 'Output pattern B', indicating a communication error between the indoor and outdoor units.

Common Causes

  • Communication error between indoor and outdoor units.
  • Faulty wiring.
  • Noise interference.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Check if the indoor/outdoor connecting wire is connected correctly.

  2. 2

    Verify that no noise is entering the indoor/outdoor connecting wire or power supply.

  3. 3

    Re-check the error by turning off the main power, waiting, and turning it back on.

Browse all codes in this manual (124)
Verified technical data. Last updated: April 2026

Related Faults

00Outdoor Board LED only green lights up after startup - No outdoor unit of address 0 / Remote controller transmission wire open1OPERATION INDICATOR lamp blinks 1 time (Pattern A) - Indoor/outdoor unit communication error (Transmitting error - Outdoor unit)14OPERATION INDICATOR lamp blinks 14 times (Pattern A) - Other errors
Source: MHI Air Conditioning
Open Manual (Page 23)Search more codes in this manual