[7-6 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
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HWE12050 GB
7 Troubleshooting Using Error Codes
7-6-10 Error Codes [4220, 4225, 4226] Detail Code 131
1. Error code definition
Low bus voltage at startup (Detail code 131)
2. Error definition and error detection method
When Vdc 160 V is detected just before the inverter operation.
3. Cause, check method and remedy
(1) Inverter main circuit failure
Same as detail code 108 of 4220 error
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems](page 234)
7-6-11 Error Code [4230]
1. Error code definition
Heatsink overheat protection
2. Error definition and error detection method
When the heat sink temperature (THHS) remains at or above 105°C [221°F] is detected.
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems](page 234)
Cause Check method and remedy
(1) Fan board failure Refer to the following page(s).
[8-9-7 Checking the Fan Board Error Detection Circuit at No Load](page 237)
[8-9-8 Checking the Fan Inverter for Damage at No Load](page 238)
[8-9-9 Checking the Fan Inverter for Damage with Load](page 239)
(2) Outdoor unit fan failure Check the outdoor unit fan operation.
If any problem is found with the fan operation, check the fan motor.
Refer to the following page(s). [8-9-6 Checking the Fan Motor for Ground Fault
and Coil Resistance Problems](page 237)
(3) Air passage blockage Check that the heat sink cooling air passage is not blocked
(4) THHS failure 1) Check for proper installation of the INV board IGBT. (Check for proper instal-
lation of the IGBT heatsink.)
2) Check the THHS sensor reading on the LED monitor.
If an abnormal value appears, replace the INV board.
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