Error 212 — Rotary switch for address setting has 3 or more of the same address

What does 212 mean?

The rotary switch used for setting the address of an indoor unit (likely on the MCU) has been incorrectly set. This has resulted in three or more units sharing the same address, causing a network conflict.

• Installation error during address setting
• Incorrect physical setting of rotary switches
• Lack of attention to unique addressing requirements

Click steps to track your progress.

1. 1

   Turn off power to all indoor units and the entire HVAC system at the circuit breaker.

2. 2

   Locate the rotary switches on the MCU (Micro Controller Unit) of each indoor unit.

3. 3

   Carefully check and adjust each rotary switch to ensure every indoor unit has a unique address.

4. 4

   Double-check all address settings to avoid any duplicates.

5. 5

   Restore power and confirm the system operates without the error.