Mitsubishi Electric PURY-HP144, Service Handbook

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[7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ]
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7-7-11 Error Code [5301] Detail Code 120
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.
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
7-7-12 Error Code [5301] Detail Code 127
1. Error code definition
DCL electric current circuit error (Detail code 127)(outdoor unit)
2. Error definition and error detection method
When an abnormal value in the DCL electric current sensor detection circuit is detected
3. Cause, check method and remedy
For inverter-related error codes, refer to the following page(s). [8-10 Troubleshooting Inverter Problems]
Cause Check method and remedy
(1) ACCT sensor connection error Check the ACCT for proper connection.
Refer to the following page(s). [8-10-13 Simple Check on Inverter Cir-
cuit Components]
(2) ACCT sensor failure Refer to the following page(s).
[8-10-13 Simple Check on Inverter Circuit Components]
(3) Inverter failure Refer to the following page(s).
[8-10-4 Checking the Inverter for Damage at No-Load]
[8-10-5 Checking the Inverter for Damage during Compressor Oper-
ation]
(4) Compressor failure Refer to the following page(s).
[8-10-3 Checking the Compressor for Ground Fault and Coil Resis-
tance Problems]
Cause Check method and remedy
(1) Contact failure Check the wiring between CNCT1A and CNCT1B.
(2) Incorrect installation Check the wiring of SC-L terminal (YNU) or SC-B terminal
(TNU).
(3) INV board failure If the problem persists after restart operation, replace the in-
verter board.