Mitsubishi Electric PURY-P72 Service Handbook page 232

[ IX Troubleshooting ]
1. Error Code
5301 (THMU-A)
DCCT sensor fault (Detail code116)
2. Error definition and error detection method
When the bus current less than 18 Apeak is detected at startup (6Hz)
3. Cause, check method and remedy
Cause
(1) Contact failure
(2) Misorientation
(3) DCCT sensor failure
(4) INV board failure
Refer to section -7-"Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 293)
HWE0803A
(P96 and P120 models only)
Check the contact of the connector (CNCT) on the INV board, and the
contact the connector on DCCT side.
Check the installation direction of DCCT.
Replace the DCCT sensor.
Replace the INV board.
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Check method and remedy
GB