Error Codes [4250, 4255, 4256] Detail Code 105; Error Code [4250] Detail Codes 106 And 107 (Ylmu) - Mitsubishi Electric R410A Service Handbook

[7-5 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-5-26

Error Codes [4250, 4255, 4256] Detail Code 105

1. Error code definition
Overcurrent error due to short-circuited motor (Detail code 105)
2. Error definition and error detection method
When a short is detected on the load side just before starting the inverter operation.
3. Cause, Check method and remedy
In the case of 4250
Cause
(1) Short - circuited
compressor
(2) Output wiring
In the case of 4255 and 4256
Cause
(1) Short - circuited
fan motor
(2) Output wiring
For inverter-related error codes, refer to the following page(s).
[8-9 Troubleshooting Inverter Problems (TLMU)](page 264)
[8-10 Troubleshooting Inverter Problems (YLMU)](page 276)
7-5-27

Error Code [4250] Detail Codes 106 and 107 (YLMU)

1. Error code definition
Instantaneous overcurrent (Detail code 106)
Overcurrent (effective value) (Detail code 107)
2. Error definition and error detection method
When a current above the specified value is detected by the electric current sensor.
Refer to the relevant pages for the details of model names and the specified values. [7-1-1 Inverter Protection Level Ta-
ble](page 155)
3. Cause, check method and remedy
Cause
(1) Inverter output related
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems (YLMU)](page 276)
HWE14080
Check method and remedy
Refer to the following page(s).
(TLMU)
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance Problems](page
266)
(YLMU)
[8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Problems](page
278)
Check for a short circuit.
Check method and remedy
Refer to the following page(s).
(TLMU)
[8-9-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page 268)
(YLMU)
[8-10-6 Checking the Fan Motor for Ground Fault and Coil Resistance Problems](page
279)
Check for a short circuit.
Refer to the following page(s).
[8-10-2 Checking the Inverter Board Error Detection Circuit](page 278)
[8-10-3 Checking the Compressor for Ground Fault and Coil Resistance Prob-
lems](page 278)
[8-10-4 Checking the Inverter for Damage at No-Load](page 278)
[8-10-5 Checking the Inverter for Damage during Compressor Operation](page 279)
[8-10-10 Checking the Installation Conditions](page 281)
Check the IGBT module resistance value of the INV board, if no problems are found.
[8-10-14 Troubleshooting Problems with IGBT Module](page 283)
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Check method and remedy
GB