Mitsubishi Electric PURY-P72 Service Handbook page 235

[ IX Troubleshooting ]
1. Error Code
5301 (THMU-A)
Open-circuited IPM/Loose ACCT connector (Detail code 119)
2. Error definition and error detection method
Presence of enough current cannot be detected during the self-diagnostic operation immediately before inverter startup.
3. Cause, check method and remedy
P72 model
Cause
(1) Inverter output wiring problem
(2) Inverter failure
(3) Compressor failure
P96 and P120 models
Cause
(1) ACCT sensor disconnection
(2) ACCT sensor failure
(3) Inverter failure
(4) Compressor failure
Refer to section -7- "Inverter (THMU-A)" under part [4] Troubleshooting Principal Parts for error codes related to the
inverter.(page 293)
HWE0803A
Check method and remedy
Check output wiring connections.
Confirm that the U- and W-phase output cables are put through CT12
and CT22 on the INV board respectively.
Refer to IX [4] -7- (2) [3], [4].(page 296)
Refer to IX [4] -7- (2) [2].(page 295)
Check method and remedy
Check the connection of the connector (CNCT2) on the INV board.
Check for proper mounting of ACCT.
Refer to IX [4] -7- (4).
Refer to IX [4] -7- (2) [3], [4].(page 296)
Refer to IX [4] -7- (2) [2].(page 295)
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