Error Nos. 42 And 43 - LG Multi V5 Service Manual

Please refer to the Safety Precautions on pages 4-7 for more detail to prevent injury or death regarding the operation and service
WARNING
troubleshooting of the Multi V product.
Error No. Description
42
Outdoor unit low
Master: 421 pressure sensor
error.
Slave 1: 422
Slave 2: 423
43
Outdoor unit high
Master: 431 pressure sensor
error.
Slave 1: 432
Slave 2: 433
Is the sensor connected
to the PCB correctly?
Is the sensor operating
properly?
After the outdoor unit main
PCB is replaced, does the sys-
tem operate normally?
End
Disconnection or short circuit of outdoor unit
low pressure sensor.
Disconnection or short circuit of outdoor unit
high pressure sensor.
No
Yes
No
Yes
No
Yes
Pressure sensor connectors.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Details
1. Check the connection on the outdoor unit
2. Thermistor shorted or opened.
3. Check for 12 V DC between 12 V and GND
4. Check the Signal to GND (white to black) and
Connect the sensor to the PCB correctly.
Test for V DC measurements and signal to GND.
If sensor measurements fall outside correct
measurements, replace sensor.
Replace corresponding pressure sensor.
High pressure sensor.
Low pressure sensor.
ERROR CODES

Error Nos. 42 and 43

Causes
PCB.
(red to black) for 5 V DC.
use correct chart from Troubleshooting section
to compare with actual system pressure.
Images here are representative
of system components. Actual
component appearance depends
on model and system type.
161