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A failed unit can cause extreme overheating or death in such an enclosed, unattended space. POWER SUPPLY CORD The power cord supplied with this air conditioner contains a device that senses damage to the power cord. To test if your power cord is working properly, you must do the following: 1) Connect the power supply cord to an electrical outlet. 2) The power supply cord has two buttons located on the head of the plug. One button is marked “TEST”, and the other is marked “RESET”. Press the ‘