Mitsubishi Electric PUHY-HP200YNW-A Service Handbook page 140

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-11 Error Code [4220, 4225, 4226] Detail Code 111, 112
1. Error code definition
Logic error (Detail code 111, 112)
2. Error definition and error detection method
Hardware error
If only the hardware error logic circuit operates, and no identifiable error is detected.
3. Cause, Check method and remedy
In the case of 4220
Cause
(1) External noise
(2) INV board failure
In the case of 4225 and 4226
Cause
(1) External noise
(2) Fan board failure
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
7-6-12 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
Detection of insufficient drive voltage for relays on INV board
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). [8-9 Troubleshooting Inverter Problems]
BS_07_L
Check method and remedy
Refer to the following page(s). [8-9-2 Checking the Inverter Board Error Detection
Circuit]
Check method and remedy
Refer to the following page(s).
[8-9-7 Checking the Fan Board Error Detection Circuit at No Load]
[8-9-8 Checking the Fan Board for Damage at No Load]
[8-9-9 Checking the Fan Board for Damage with Load]
Check method and remedy
Check the connectors CNRY on INV board and CNRYA on MAIN board for proper
connections.
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.
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