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211

Error 211 — Single indoor unit uses 2 MCU ports not in series

Samsung · AC & Climate Systems

What does 211 mean?

A single indoor unit is connected using two MCU ports that are not configured in series, which is an incorrect setup.

Common Causes

  • Improper wiring of the indoor unit to the MCU
  • Incorrect MCU port usage
  • Configuration error

Repair Steps & Checklist

Click steps to track your progress.

  1. 1

    Review the wiring diagram for connecting indoor units to the MCU.

  2. 2

    Ensure the single indoor unit is connected to the MCU ports correctly (in series if required).

  3. 3

    Verify the configuration settings for the MCU.

  4. 4

    Consult the installation manual for proper port usage.

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

Related Faults

101Error 101 — Indoor unit communication error102Error 102 — Communication error between indoor and outdoor units108Error 108 — Repeated address setting
Source: Samsung AC & Climate Systems
Open Manual (Page 22)Search more codes in this manual