Mitsubishi Electric PQHY-P200YLM-A Service Handbook page 308

[ IX Troubleshooting ]
1. Error Code
5201
High-pressure sensor fault (BC controller PS1)
5203
Intermediate pressure sensor fault (BC controller PS3)
2. Error definition and error detection method
When a pressure sensor reading of 4.06 MPa [589 psi] or above OR 0.98Mpa[142psi] or below is detected, error codes "5201"
OR "5203" will appear.
The unit will continue its operation by using other sensors as a backup.
3. Cause, check method and remedy
(1) High pressure sensor failure
(2) Torn wire coating
(3) A pin on the male connector is missing or contact failure
(4) Disconnected wire
(5) High pressure sensor input circuit failure on the control board
1. Error Code
5301
ACCT sensor fault (Detail code 115)
2. Error definition and error detection method
When the formula "output current < 1.8 Arms" remains satisfied for 10 seconds while the inverter is in operation.
3. Cause, check method and remedy
Cause
(1) Inverter open output phase
(2) Compressor failure
(3) INV board failure
Refer to section -6- " Inverter " under part [4] Troubleshooting Principal Parts for error codes related to the inverter.
HWE15060
Cause
Check the output wiring connections.
Refer to IX [4] -6- (2) [2].
Refer to IX [4] -6- (2) [1], [3], [4].
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Check method and remedy
Refer to the following page(s). (page 348)
Check for damaged wire coating
Check whether a connector pin is missing
Check for disconnected or broken wire
Check the temperature detected by the sen-
sor from the LED monitor. If the temperature
is significantly different from the actual tem-
perature, replace the control board.
Check method and remedy
GB