LG MULTI V M ARNU07GTU 4 Series Svc Manual page 67

Error No. Error Type
Over-increase discharge
temperature of inverter
321
compressor 1 at main
Compressor Module
n Error diagnosis and countermeasure flow chart
Is the amount of
refrigerant normal?
[refer refrigerant part]
Yes
Is the resistance of discharge
temperature sensor normal?*
Yes
Is EEV in
Compressor Module normal
at heating operation?
[refer electric
component part]
Yes
Does liquid injection
corresponded
operate normally?
Yes
Is there pipe
(strainer etc.) clogging?
Yes
Replace strainer
Error Point
Compressor is off because
of over-increase discharge
temperature of inverter
compressor 1
No
Is there pipe crack
or trace of leakage?
Yes
Weld / reconnect the cracked
portion and recharge refrigerant
No
Replace discharge
temperature sensor
* Resistance value of discharge temperature sensor
10C = 362k, 25C= 200k, 50C= 82k, 100C= 18.5k
No
Replace Compressor Module
EEV
No
Check liquid injection
corresponded
Check another components
No
and operation conditions
/ Take measures
- 67 -
Troubleshooting Guide
Main Reasons
1. Temperature sensor defect of inverter
compressor 1 discharge pipe
2. Refrigerant shortage / leak
3. EEV defect
4. Liquid injection valve defect
Change the amount of
No
refrigerant
(Charge additive amount)
Copyright © 2018 LG Electronics Inc. All rights reserved.
Only training and service purposes.