Error No. 22 - LG Multi V5 Service Manual

ERROR CODES

Error No. 22

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
22
Outdoor unit
AC inverter board
Master: 221
input overcurrent
(RMS) error.
Slave 1: 222
Slave 2: 223
See the "Checking the Inverter
Insulated-Gate Bipolar Transis-
tor Module" and the "Checking
the Phase Diode Bridge"
pages in the "Troubleshooting
Main Components" section.
Always apply heat
transfer paste to the new
inverter PCB heat sink
before installing. For
bridge diode connections correct?
instructions, see "Re-
placing the Inverter PCB
Heat Sink" page later in
this section.
146
The three-phase input power current for the
inverter PCB assembly is >22A.
Is the installation
correct?
Yes
between each phase and
resistance correct?
Yes
wiring connections correct?
Yes
Yes
Yes
correct?
Yes
Recheck power and installation.
Due to our policy of continuous product innovation, some specifications may change without notification.
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Details
1. Overload: Pipe has been clogged, EEV is
2. Compressor motor or insulation has been
3. Input voltage is low.
4. Improper connections in the power wiring.
5. Inverter PCB assembly has been damaged
1. Check the piping for clogs and damage.
2. Check if the indoor or outdoor unit is blocked.
3. Check if the EEV connection assembly is correct and operating
No
properly.
4. Check refrigerant pressure.
1. Check resistance between each compressor terminal.
JQC068MA
No
Temp. 77°F
U-V
V-W
W-U
JQC068MB / JQC068MBA
Temp. 77°F
U-V 0.1
V-W 0.1
W-U 0.1
2. Check insulation resistance between compressor terminal and
No
2. Check wiring for disconnections and damage.
3. Check compressor terminal connections for bad contacts.
No
Check
No
No
Causes
defective, indoor or outdoor unit is blocked,
there has been an overcharge in refriger-
ant.
damaged.
(input current sensor).
JQC048MA
167°F Temp. 77°F 167°F
U-V
V-W
W-U
JQC048MB / JQC048MBA
167°F Temp. 77°F 167°F
U-V 0.1
V-W 0.1
W-U 0.1
assembly.