Mitsubishi Electric NTXMSM36A142BA Technical & Service Manual page 87

Check code
5201
(F5)
Abnormal points and detection methods
When the detected pressure in the high pressure sensor is 14 PSIG or
less during operation, the compressor stops operation and enters into
an anti-restart mode for 3 minutes.
When the detected pressure is 14 PSIG or less immediately before
restarting, the compressor falls into an abnormal stop with a check code
<5201>.
For 3 minutes after compressor restarting, during defrosting operation,
and for 3 minutes after returning from defrosting operation, above
mentioned symptoms are not determined as abnormal.
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Check the wiring and connector connection.
Is there any abnormality such
as disconnection, looseness or
breakage?
Check the internal pressure of the
refrigerant circuit.
Is the detected internal pressure
normal?
Check the detected pressure in 63HS(*),
then compare it with the internal pressure.
Is the detected pressure normal?
OCHT810A
High pressure sensor (63HS) trouble
Diagnosis
No
Yes
*For the pressure, refer to "8-8.HOW
TO CHECK COMPONENTS".
Causes and checkpoints
Defective high pressure sensor
Decrease of internal pressure caused by gas
leakage
Disconnection or contact failure of connector
Malfunction of input circuit on outdoor controller
board
The black square (■) indicates a switch position.
63HS: High pressure sensor
Connect the wiring/connector properly.
Yes
Replace it in the case of breakage.
Check the refrigerant circuit, and recharge
No
refrigerant after repairing the leakage.
The detected pressure in 63HS can be displayed by an
operation of SW1 on the outdoor controller board.
SW1 Setting Display on LED1, 2
ON
−99.9–999.9
OFF
1 2 3 4 5 6 7 8
No
Replace the outdoor controller board.
87
Remedy
Unit
PSIG
Replace the 63HS.