Mitsubishi Electric · Air Conditioning
This fault indicates that the L3 phase of the power supply is not detected. This could be due to an issue with the power supply itself or protective devices.
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Check the main power supply, ensuring all phases are present.
Inspect any circuit protection devices (fuses, breakers) for the L3 phase.
Verify the wiring connections for the L3 phase are secure.
Ensure the power source is stable.