MHI · R410A Systems
This error code signifies a high-pressure condition in the outdoor unit, specifically linked to a closed ball valve.
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Turn off the power to the air conditioner at the main circuit breaker.
Have a qualified HVAC technician inspect the outdoor unit's service valves to ensure they are fully open.
The technician should also check refrigerant pressure.
Only restore power after the valve position has been corrected by a professional.