Mitsubishi Electric CMB-WP108NU-AA Service Handbook page 117

[ VIII Troubleshooting ]
5201
1. Error Code
5201
High-pressure sensor fault (Outdoor unit 63HS1)
2. Error definition and error detection method
Refer to 5201 in outdoor unit service handbook.
1. Error Code
5201
High-pressure sensor fault (HBC PS1)
5203
Intermediate pressure sensor fault (HBC PS3)
2. Error definition and error detection method
When a pressure sensor reading of 4.06 MPa [589 psi] or above or 0.098 Mpa [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
Cause
(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
5301
1. Error Code
5301
Backup operation (Detail code 0)
2. Error definition and error detection method
Refer to 5301 (Detail code 1) in outdoor unit service handbook.
1. Error Code
5301
ACCT sensor fault (Detail code 115)
2. Error definition and error detection method
Refer to 5301 (Detail code 115) in outdoor unit service handbook.
HWE2206A
Check method and remedy
Refer to the page on the troubleshooting of the high pressure
sensor in outdoor unit service handbook.
Check for damaged wire coating
Check whether a connector pin is missing
Check for disconnected or broken wire
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