Mitsubishi Electric City Multi PURY-EM200YNW-A1, Service Handbook

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[7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ]
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- chapter 7 BS_07_M
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7-7-14 Error Code [5301, 5305, 5306] 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
[Outdoor unit]
[HBC]
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). [8-10-18 Simple Check on Inverter Cir-
cuit Components]
(2) ACCT sensor failure Refer to the following page(s).
[8-10-18 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) Pump inverter board failure Refer to the following page(s).
[8-10-12 Checking the Error-Detection Circuit on the Pump INV
Board (Without load)]
[8-10-13 Checking the Pump INV Board for Damage (Without load)]
[8-10-14 Checking the Pump INV Board for Damage (During pump
operation)]
(2) Pump failure Refer to the following page(s).
[8-9-4 Water Pump Control]
[8-10-11 Checking the Pump Motor for Ground Fault and Coil Resis-
tance Problems]
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