Error Code [5301] Detail Code 120 (Tlmu) - Mitsubishi Electric R410A Service Handbook

[7-6 Error Code Definitions and Solutions: Codes [5000 - 5999] ]
7-6-13

Error Code [5301] Detail Code 120 (TLMU)

1. Error code definition
Faulty ACCT wiring (Detail code 120)
2. Error definition and error detection method
Presence of target current cannot be detected during the self-diagnostic operation immediately before startup. (Detection of
improperly mounted ACCT sensor)
3. Cause, check method and remedy
P72, P96, P120, P144 models
Cause
(1) Inverter output wiring problem
(2) Inverter failure
(3) Compressor failure
(4) INV board failure
P168 model
Cause
(1) Wrongly mounted ACCT sensor
(2) ACCT sensor failure
(3) Inverter failure
(4) Compressor 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
Check output wiring connections.
Confirm that the U- and W-phase output cables are put through CT11 and
CT12 on the INV board respectively.
Refer to the following page(s).
[8-9-4 Checking the Inverter for Damage at No-Load](page 267)
[8-9-5 Checking the Inverter for Damage during Compressor Opera-
tion](page 268)
Refer to the following page(s).
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems](page 266)
Replace the INV board.
Check method and remedy
Check for proper mounting of ACCT.[8-9-13 Simple Check on Inverter Cir-
cuit Components](page 272)
[8-9-13 Simple Check on Inverter Circuit Components](page 272)
Refer to the following page(s).
[8-9-4 Checking the Inverter for Damage at No-Load](page 267)
[8-9-5 Checking the Inverter for Damage during Compressor Opera-
tion](page 268)
Refer to the following page(s).
[8-9-3 Checking the Compressor for Ground Fault and Coil Resistance
Problems](page 266)
- 201 - GB