Error No. 29 - 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
29
Outdoor unit
inverter
Master: 291
compressor
Slave 1: 292
overcurrent error.
Slave 2: 293
Is the installation correct?
Are the resistance
between each phase and the
inverter compressor insulation
resistance correct?
See the "Checking the
Inverter Insulated-Gate
Bipolar Transistor
Module" page in the
"Troubleshooting Main
Components" section.
Yes
Are the compressor wiring
connections correct?
Is the input voltage normal?
Is the compressor PCB
assembly correct?
Recheck power and installation.
Inverter compressor input current is >30A.
No
Yes
No
No
Yes
No
Yes
No
Yes
Due to our policy of continuous product innovation, some specifications may change without notification.
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Details
1. Overload operation (piping is clogged,
2. Compressor insulation and / or motor is /
3. Input voltage is low.
4. Outdoor unit Inverter PCB assembly is
1. Check if piping is clogged or has been damaged.
2. Check if outdoor or indoor units are blocked.
3. Check the EEV connector assembly and verify it is operating normally.
4. Check the refrigerant pressure.
1. Check the resistance between each compressor terminal.
JQC068MA
Temp. 77°F 167°F
U-V
V-W
W-U
JQC068MB / JQC068MBA
Temp. 77°F 167°F
U-V
V-W
W-U
2. Check insulation resistance between compressor terminal and pipe
1. Check Inverter compressor PCB assembly, U,V,W connections.
2. Check if the wires have disconnected or were damaged.
3. Check compressor terminal connections for bad contacts.
Check if R~S / S~T / T~R phase voltage is <180V or >253V
(for 208-230V units), or <414V or >528V (for 460V units).
Check if Inverter compressor PCB assembly and IPM are correct.
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.
ERROR CODES

Error No. 29

Causes
indoor or outdoor unit is blocked, EEV is
defective, refrigerant is overcharged).
are damaged.
damaged.
JQC048MA
Temp. 77°F
U-V
V-W
W-U
JQC048MB / JQC048MBA
Temp. 77°F
U-V
V-W
W-U
167°F
167°F
153