Error Code [4220] Detail Code 123; Error Code [4220] Detail Code 124 - Mitsubishi Electric PUHY-P200 Service Handbook

[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-6-12

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). [8-9 Troubleshooting Inverter Problems](page 264)
7-6-13

Error Code [4220] Detail Code 124

1. Error code definition
BUS circuit fault (Detail code 124)(outdoor unit)
2. Error definition and error detection method
When a malfunction of the relay (RY 2, 3, or 4) on the inverter board is detected
3. Cause, check method and remedy
Cause
(1) Contact failure
(2) Inverter-output-related
items
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems](page 264)
HWE14040
Check method and remedy
Refer to the following page(s). [8-9-2 Checking the Inverter Board Error Detection
Circuit](page 266)
Refer to the following page(s). [8-9-3 Checking the Compressor for Ground Fault
and Coil Resistance Problems](page 266)
Refer to the following page(s). [8-9-4 Checking the Inverter for Damage at No-
Load](page 266)
Refer to the following page(s). [8-9-5 Checking the Inverter for Damage during Com-
pressor Operation](page 267)
Refer to the following page(s). [8-9-11 Checking the Installation Conditions](page
271)
Check method and remedy
Refer to the following page(s). [8-9-4 Checking the Inverter for Damage at No-
Load](page 266)
Refer to the following page(s). [8-9-5 Checking the Inverter for Damage during Com-
pressor Operation](page 267)
Refer to the following page(s). [8-9-2 Checking the Inverter Board Error Detection
Circuit](page 266)
Refer to the following page(s). [8-9-3 Checking the Compressor for Ground Fault
and Coil Resistance Problems](page 266)
Refer to the following page(s). [8-9-4 Checking the Inverter for Damage at No-
Load](page 266)
Refer to the following page(s). [8-9-5 Checking the Inverter for Damage during Com-
pressor Operation](page 267)
Refer to the following page(s). [8-9-11 Checking the Installation Conditions](page
271)
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