Mitsubishi Electric PUHY-M200YNW-A1 Service Handbook page 200

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-14 Error Codes [4220, 4225, 4226] Detail Code 109
1. Error code definition
Abnormal bus voltage rise (Detail code 109)
2. Error definition and error detection method
If Vdc 830V is detected during inverter operation. (Outdoor unit)
If Vdc 425V is detected during inverter operation. (Hydro unit)
3. Cause, check method and remedy
Outdoor unit
(1) Different voltage connection
Check the power supply voltage on the power supply terminal block (TB1).
(2) INV board failure
If the problem recurs, replace the INV board or fan board.
In the case of 4220: INV board
In the case of 4225 and 4226: Fan board
Hydro unit
(1) Different voltage connection
Check that the power-supply voltage between 198 and 264 VAC is applied to the power-supply terminal block (TB01).
Check the power supply voltage waveform for distortion.
(2) INV board failure
If the problem persists, replace the INV board.
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
7-6-15 Error Code [4220] Detail Code 110
1. Error code definition
VDC error (Detail code 110)
2. Error definition and error detection method
BUS voltage error When Vdc is equal to or greater than 814 volts (hardware detection)
3. Cause, check method and remedy
Details of 4220 error: See No. 108 and 109.
Also see error details No. 129 of 4220 error (applicable to INV37YC only).
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
BS_07_E
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