Mitsubishi Electric PQHY-P72ZLMU-A Service Handbook page 280

[ IX Troubleshooting ]
1. Error Code
5201
High-pressure sensor fault (63HS1)
2. Error definition and error detection method
If the high pressure sensor detects 0.098MPa [14psi] or less during the operation, the heat source unit stops once, turns to
anti-restart mode for 3 minutes, and restarts after 3 minutes when the detected high pressure sensor is 0.098MPa [14psi] or
more.
If the high pressure sensor detects 0.098MPa [14psi] or less just before the restart, the heat source unit makes an error stop,
and the error code "5201" will appear.
During 3-minute antirestart mode, preliminary errors will be displayed on the LED display.
A error is not detected for 3 minutes after the compressor start.
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
HWE15150
Cause
- 271 -
Check method and remedy
Refer to the page on the troubleshooting of
the high pressure sensor.
(IX [4] -1- )
GB