MHI · R410A Systems
This error indicates a problem with the indoor unit's coil frost protection or overheating protection modes, suggesting temperature regulation issues.
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Turn off the power to the air conditioner at the circuit breaker.
Check and clean or replace the indoor unit's air filters.
Ensure the indoor coil is clean and free of debris or ice buildup.
Restart the unit after 5-10 minutes. If the error reoccurs, contact a qualified technician to check refrigerant levels and sensor operation.