MXZ-SM36NAMHZ Service Manual

89
OCH789
Check code
5202
(F3)
Low pressure sensor (63LS) trouble
Abnormal points and detection methods Causes and checkpoints
When the detected pressure in the low pressure sensor is −33 PSIG
or less, or 329 PSIG 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.
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
●Diagnosis of defects
Make sure to turn the power OFF before connecting/disconnecting
any connectors, or replacing boards.
Diagnosis Remedy
The black square (■) indicates a switch position.
63LS: Low pressure sensor
No
Yes
Yes
No
No
Is there any abnormality such
as disconnection, looseness or
breakage?
Is the detected internal pressure
normal?
Is the detected pressure normal?
Connect the wiring/connector properly.
Replace it in case of breakage.
Check the refrigerant circuit, and rell
refrigerant after repairing the leakage.
Replace the 63LS.
Replace the outdoor controller board.
Check the wiring and connector
connection.
Check the internal pressure of the
refrigerant circuit.
Check the detected pressure in 63LS, then
compare it with the internal pressure.
ON
OFF
1 2 3 4 5 6 7 8
SW1 Setting
Display on LED1,2 Unit
−99.9–999.9 PSIG
The detected pressure in 63LS can be displayed by an
operation of SW1 on the outdoor controller board.