Mitsubishi Electric CMB-WM108V-AA Service Handbook page 155

[ VIII Troubleshooting ]
5201
1. Error Code
5201
High-pressure sensor fault (Outdoor unit 63HS1/HBC controller PS)
2. Error definition and error detection method
When a pressure sensor reading of 4.06 MPa [589 psi] or above is detected, error codes "5201" and "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) Pressure drop due to refrigerant leak
(3) Torn wire coating
(4) A pin on the male connector is missing or contact failure
(5) Disconnected wire
(6) High pressure sensor input circuit failure on the control board
HWE1708A
Cause
- 146 -
Check method and remedy
Refer to the page on the troubleshooting of
the high pressure sensor in outdoor unit ser-
vice handbook.
GB