31CAUTION!.....Tighten the power cord respectively on the terminal boards withIf the power supply are wired incorrectly, the air conditioner may be damaged.Connect the indoor unit connection cord properly based on the corresponding marks as shown inFig.3 .Ground both the indoor and outdoor units by attaching a ground wire.Unit shall be grounded in compliance with the applicable local and national codes.6 Installation of ControllersRefer to the Installation Manual of the controller for more details.7 Test Running7.1 Trial Operation and Testing(1). The meaning of error codes as shown below:Cassete - Multi-Split