Mitsubishi Electric PURY-M200YNW-A1 Service Handbook page 211

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-18 Error Code [4220] Detail Code 123
1. Error code definition
Voltage boost control error (Detail code 123)(outdoor unit)
2. Error definition and error detection method
When a drop in power supply voltage or a malfunction in the booster circuit is detected
3. Cause, check method and remedy
Cause
(1) Inverter-output-related
items
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
7-6-19 Error Code [4220] Detail Code 129
1. Error code definition
Control power supply error (Detail code 129)(outdoor unit)
2. Error definition and error detection method
INV35Y and INV42Y
Detection of insufficient drive voltage for relays on INV board
INV37YC
Detection of insufficient drive voltage for relays on INV board or for IGBT
3. Cause, check method and remedy
Cause
(1) Contact failure
(2) Voltage check
(3) Inverter board failure
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
38
- chapter 7
Check method and remedy
Refer to the following page(s). [8-10-2 Checking the Inverter Board Error Detection
Circuit]
Refer to the following page(s). [8-10-3 Checking the Compressor for Ground Fault
and Coil Resistance Problems]
Refer to the following page(s). [8-10-4 Checking the Inverter for Damage at No-
Load]
Refer to the following page(s). [8-10-5 Checking the Inverter for Damage during
Compressor Operation]
Refer to the following page(s). [8-10-15 Checking the Installation Conditions]
Check method and remedy
<INV35Y and INV42Y>
Check the connectors CNRY on INV board and CNRYA on MAIN board for proper
connections.
<INV37YC>
Check the connectors CNRY on INV board and CNRYA on MAIN board for proper
connections.
Check the connectors CN200 on INV board and CN300 on PS board for proper con-
nections.
Disconnect the connector CNRYA from the control board and check the voltage at
the connector CNRYA. If a voltage of 13 V is not output, replace the control board
and the PS board.
If the problem persists after reboot, replace the INV board.
BS_07_M