Samsung Air Conditioner Error Code E573

The E573 error code on a Samsung air conditioner indicates a system configuration conflict: a single-type outdoor unit has been detected in an installation that requires a module-type outdoor unit. Samsung multi-zone and VRF-style systems are designed to operate with specific outdoor unit types, and when the control system identifies that the connected outdoor unit is a standalone single-type unit rather than a compatible modular unit, it triggers this fault to prevent improper operation. The error is essentially a mismatch between the outdoor unit hardware and the expected system architecture.

This type of error is fundamentally an installation or commissioning issue rather than a mechanical or electrical component failure. Module installations are designed to link multiple outdoor units together to serve larger or multi-zone indoor unit configurations. A single-type outdoor unit lacks the communication protocols, capacity staging logic, and inter-unit bus connections required for module operation. The control board detects this incompatibility during initialization or operation and raises E573 to halt normal function.

Resolving E573 requires verifying that the correct outdoor unit type is installed for the intended system configuration. Technicians should review the system design specifications to confirm which outdoor unit model is required for the module installation. If a single-type unit was installed in error, it must be replaced with the appropriate modular outdoor unit. Configuration settings in the control board or service menu should also be reviewed to ensure the system type is correctly defined.