MHI · R410A Systems
This error means the anti-phase device has detected that two phases of the mains power need to be swapped, or the L2 phase of the mains power has been detected as open.
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Turn off the main power supply to the air conditioning system at the circuit breaker.
Consult a qualified electrician to inspect the main power supply wiring for correct phase sequence.
The electrician will check for open circuits on the L2 phase and inspect the contactor.
Do not restore power until a professional has identified and corrected the issue.