Error Codes [4220, 4225, 4226] Detail Code 111 (Tlmu) - Mitsubishi Electric R410A Service Handbook

[7-5 Error Code Definitions and Solutions: Codes [4000 - 4999] ]
7-5-15

Error Codes [4220, 4225, 4226] Detail Code 111 (TLMU)

1. Error code definition
Logic error (Detail code 111)
2. Error definition and error detection method
H/W error
If only the H/W 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
(3) IPM failure (P168 model only)
(4) DCCT failure (P168 model only)
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 (TLMU)](page 264)
HWE14080
Check method and remedy
Refer to the following page(s). [8-9-2 Checking the Inverter
Board Error Detection Circuit](page 266)
Replace the IPM.
Replace the DCCT.
Check method and remedy
Refer to the following page(s).
[8-9-7 Checking the Fan Board Error Detection Circuit at No
Load](page 268)
[8-9-8 Checking the Fan Inverter for Damage at No
Load](page 269)
[8-9-9 Checking the Fan Inverter for Damage with Load](page
270)
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