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211

Error 211 - Single indoor unit uses 2 non-series MCU ports

Samsung · Home Automation

What does 211 mean?

A single indoor unit has been incorrectly connected to two MCU (Microcontroller Unit) ports that are not meant to be used in series.

Common Causes

  • Incorrect wiring configuration during installation
  • Misunderstanding of MCU port assignments

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Power off the entire HVAC system immediately.

  2. 2

    Review the wiring of the indoor unit to the MCU according to the installation manual.

  3. 3

    Ensure the indoor unit is connected to only one appropriate MCU port as specified in the instructions.

Browse all codes in this manual (60)
Verified technical data. Last updated: April 2026

Related Faults

101Error 101 - Indoor unit communication error102Error 102 - Indoor/Outdoor unit communication error108Error 108 - Repeated address setting
Source: Samsung Home Automation
Open Manual (Page 22)Search more codes in this manual