Mitsubishi Electric CITY MULTI PUHY-P108 Service Handbook page 247

[ IX Troubleshooting ]
Example
Code 4225 : Bus voltage drop in the fan inverter system
Code 4250 : IPM / overcurrent breaker trip in the compressor inverter system
The last digit Inverter address (system)
0 or 1
5
1
5
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Inverter system
Compressor inverter system
Fan inverter system