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Communication error

Communication error — Indoor/outdoor inverter main MICOM communication lost

Samsung · Air Conditioning

What does Communication error mean?

A communication error has occurred between the indoor and outdoor inverter MAIN MICOM components for at least one minute. This prevents proper system operation and displays 'Communication error'.

Common Causes

  • Faulty MAIN MICOM component.
  • Faulty INVERTER MICOM component.

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Turn off the main power supply to the air conditioner for a few minutes, then restart it.

  2. 2

    Ensure that all internal wiring and connections are secure (may require professional inspection).

  3. 3

    If the error persists after a reset, contact a qualified service technician for further diagnosis and repair.

Browse all codes in this manual (94)
Verified technical data. Last updated: April 2026

Related Faults

COND temperature sensor errorCondenser temperature sensor error — Outdoor coil temperature sensor faultCommunication error after trackingCommunication error after finishing tracking — System communication issue following a tracking processCommunication error between indoor/outdoor INV MAIN MICOM (1 min)Communication error between main and inverter microcontrollers — Internal communication fault
Source: Samsung Air Conditioning
Open Manual (Page 54)Search more codes in this manual