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

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An indoor unit has been incorrectly wired or configured to use two MCU (Micro Controller Unit) ports that are not designed to be used in series. This improper connection can lead to operational errors.

• Wiring error during installation
• Incorrect configuration settings for MCU ports
• Misunderstanding of MCU port functionality

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1. 1

   Immediately cut power to the affected indoor unit and the entire HVAC system at the circuit breaker.

2. 2

   CAUTION: This requires a professional. Carefully review the wiring diagram for the indoor unit and its MCU connections.

3. 3

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

4. 4

   Correct any incorrect wiring.

5. 5

   Restore power and verify the error is resolved. If you're unsure, contact a qualified technician.