MHI · R410A Systems
This code indicates that the discharge temperature is abnormally high, there's insufficient refrigerant in the system, or the compressor discharge temperature sensor (THOD) is defective.
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Turn off the main power to the AC system at the circuit breaker and allow the unit to cool down.
Check for any visible ice formation on the refrigerant lines, which might indicate low refrigerant.
Contact a qualified HVAC technician to check refrigerant levels, inspect the THOD sensor, and diagnose any overheating issues.
Do not continue to operate the unit as high discharge temperatures can damage the compressor.