Low-Pressure Sensor Trouble - Mitsubishi PUMY-P60NKMU Technical & Service Manual

Check code
5202
Abnormal points and detection methods
When the detected pressure in the low-pressure sensor is -2.3kgf/F
or less, or 23.1kgf/F or more during operation, the compressor stops
operation with a check code <5202>.
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 defectives
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 a disconnection, looseness or
breakage?
Check an internal pressure of the
refrigerant circuit.
Is the detected internal pressure
normal?
Check the detected pressure in 63LS, then
compare it with the internal pressure.
Is the detected pressure normal?
OCH502C
Low-pressure sensor (63LS) trouble
Diagnosis
Yes
No
No
Yes
No
Causes and check points
Defective low-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.
63LS: Low-pressure sensor
Connect the wiring/connector properly.
Replace it in case of a breakage.
Check the refrigerant circuit, and refi ll
refrigerant after repairing the leakage.
The detected pressure in 63LS can be displayed by an
operation of SW1 on the outdoor controller board.
SW1 Setting
Display on LED1,2 Unit
ON
-99.9 999.9 kgf/cm²
OFF
1 2 3 4 5 6 7 8
*1kgf/F =14.22PSIG
Replace the outdoor controller board.
65
Remedy
Replace the 63LS.