Samsung · AC & Climate Systems
This error occurs when the outdoor unit is preparing for cooling (or heating) and one or more indoor units are attempting to operate in the opposite mode (heating or cooling).
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Ensure all indoor units are set to the same operating mode (e.g., all cooling or all heating).
Review the system's setup and configuration settings.
Avoid trying to run heating and cooling simultaneously with different indoor units.
Consult the user manual for mode compatibility.