Error Code [5120]; Error Code [5201] - Mitsubishi Electric PUHY-P250YNW-A Service Handbook

[7-7 Error Code Definitions and Solutions: Codes [5000 - 5999] ]
7-7-4

Error Code [5120]

1. Error code definition
DCL temperature sensor circuit fault (Detail code 01)(outdoor unit)
2. Error definition and error detection method
When an open phase or a short circuit of the temperature sensor is detected immediately before inverter startup or during
operation (applicable to INV37YC only)
3. Cause, check method and remedy
INV37YC
(1) Contact failure
(2) DCL temperature sensor
(3) INV board failure
For inverter-related error codes, refer to the following page(s). [8-9 Troubleshooting Inverter Problems]
7-7-5

Error Code [5201]

1. Error code definition
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 outdoor unit stops once, turns to anti-
restart mode for 20 seconds, and restarts after 20 seconds 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 outdoor unit makes an error stop, and
the error code "5201" will appear.
During 20-second 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
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Cause
Cause
Check method and remedy
Check the connector (CNTH) on the inverter board for proper
connection.
Disconnect the connector (CNTH), check the resistance val-
ue of the DCL temperature sensor.
Replace the DCL if the resistance is as follows: 0.5 kΩ or be-
low (short-circuit) or 1963 kΩ or above (open-circuit).
If the problem persists after restart operation, replace the in-
verter board.
Check method and remedy
Refer to the following page(s). [8-5-1 Com-
paring the High-Pressure Sensor Measure-
ment and Gauge Pressure]
BS_07_C