MHI · Air Conditioning
After the initial 'startup' sequence, if the outdoor unit's LED1 (green) blinks once and LED2 (red) blinks once alternately, it indicates an incorrect connection of the outdoor terminal block (L1, L2, S1, S2, S3).
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Turn off the main power supply to the unit.
Carefully check the connections of the outdoor terminal block (L1, L2, S1, S2, S3) and ensure they are correct.
Restore power and re-check the display.