What does it mean if both the OPERATION Indicator Lamp and TIMER Indicator Lamp flash simultaneously?
If both the OPERATION Indicator Lamp and the TIMER Indicator Lamp flash simultaneously, it means the unit has been accidentally switched to test operation mode by pressing the TEST RUN button. To stop the test operation mode, press the START/STOP button to turn off the air conditioner. (Page 4)
From the official Fujitsu Inverter Halcyon manual, page 4
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