Error No. 23 - LG Multi V5 Service Manual

ERROR CODES

Error No. 23

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
23
Low DC voltage
sensed at the out-
Master: 231 door unit inverter
compressor DC
Slave 1: 232
link.
Slave 2: 233
Check DC link connections.
Table 79: Error No. 23 Checkpoint Details.
Cause Check
Input
Check Input Voltage
Voltage Abnormal
DC Link
Check DC Link Voltage
Power Abnormal
Check Converter PCB
Appearance
Converter
PCB damaged Measure 5V,15V line
Check Bridge Diode
148
Details
System shut off because
the DC link voltage fell
below 50V (for both 208-
230V and 460V units), or
exceeded 550V (for 208-
230V units) or 1,000V (for
460V units) for a minimum
of 250μs.
DC Link Connector
Check Point
3P3W, 220V 220V ± 15%
Voltage
3P3W, 460V 460V ± 15%
3P3W, 220V
Voltage
3P3W, 460V
Appearance
5V, 15V Resistance
P-R,S,T / N-R,S,T
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1. Start diagnosis at the inverter socket on the outdoor unit noise
filter PCB.
2. There is a capacitor that is not working properly, or the voltage at
the capacitor is out of range (either high or low).
3. Disconnected DC link.
4. Damaged electrical condenser component (serving capacitor) on
inverter driver board.
Measure input voltage.
Images here are representative of system components. Actual compo-
nent appearance depends on model and system type.
See the "Checking the Inverter Insulated-Gate Bipolar Transistor Mod-
ule" and the "Checking the Phase Diode Bridge" pages in the "Trouble-
shooting Main Components" section.
Always apply heat transfer paste to the new inverter PCB heat sink
before installing. For instructions, see "Replacing the Inverter PCB Heat
Sink" page later in this section.
Checklist
Normal Abnormal
Non-normal
310V±20%
650V±20%
Good Damage
0.38V ~ 0.7V Non-normal
Causes
App.
Defective
Parts
A1
Input Voltage
(Power ON)
A3
Converter
(Power ON and
PCB
Compressor operating)
Converter B2
PCB (Power Off)