How do I operate the air conditioner if I lose the Remote Controller?
You can use the Manual Auto Operation by pressing the MANUAL AUTO button on the main unit control panel for more than 3 seconds but less than 10 seconds. The unit will operate in AUTO mode with the fan speed set to AUTO and the thermostat set to a standard temperature of 76°F. To stop operation, press the MANUAL AUTO button for 3 seconds. (Page 12)
From the official Fujitsu Inverter Halcyon manual, page 12
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