Compressor - LG MULTI V 5 Manual Book

Error No. Error Type Error Point
Error
Error Type Error Point
No.
24*
Master
Excessive rise of Compressor off due
241
discharge to the high pressure
24*
Slave1
pressure in outdoor switch in outdoor
Excessive rise of discharge Compressor off due to the
242

compressor

unit
pressure in outdoor com- high pressure switch in
Slave2
pressor outdoor unit
243
Slave3
244
n Error diagnosis and countermeasure flow chart
Is high pressure switch
No
Connect securely
connector connected
to PCB?*
Note 1)
Yes
Is high pressure switch
No Is high pressure switch
connector short
terminal short?***
during off time?**
Note 2)
Yes
Yes
Replace connecting cable
No
Is SVC valve open? Open SVC valve
Yes
No
Is this error appeared Re-check momentary
problem or not
again after reset?
Yes
Is high pressure Replace PCB
No
more than 2500kPa CH24 : inverter compressor PCB
at manifold gauge? CH109~154 : sub unit PCB
Yes
Is high pressure of
No
LGMV similar as
Replace high pressure sensor
at manifold gauge?
Yes
Check pipe is blocked or
not and take measure
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
098
_TROUBLE SHOOTING GUIDE BOOK
Main Reasons
1. Defective high pressure switch
Main Reasons
2. Defective fan of indoor unit or outdoor unit
3. Check valve of compressor clogged
1. Defective high pressure switch
4. Pipe distortion due to the pipe damage
2. Defective fan of indoor unit or outdoor unit
5. Refrigerant overcharge
3. Check valve of compressor clogged
4. Pipe distortion due to the pipe damage
6. Defective EEV at the indoor or outdoor unit.
5. Refrigerant overcharge
7. Covering or clogging(Outdoor covering
6. Defective EEV at the indoor or outdoor unit.
during the cooling mode /Indoor unit filter
7. Covering or clogging(Outdoor covering dur-
clogging during the heating mode)
ing the cooling mode /Indoor unit filter clog-
8. SVC valve clogging
ging during the heating mode)
9. Defective outdoor PCB
8. SVC valve clogging
10. Defective active path valve 9. Defective outdoor PCB
10. Defective active path valve
No
Replace high pressure switch
Note 2)
Note 1) High pressure switch
connector on Main PCB
Note 2) Check short with high
pressure switch connector
- 114 -
LGE Internal Use Only
Error
Error Type Error Point
No.
25*
Master
Error No. Error Type Error Point
251
Slave1
Input voltage is over limited
Input voltage is over
252
Input Voltage high/low value of the product (304 V
limited value of the
or less, 536 V or more)
Slave2
25* Input Voltage high/low
product (304 V or less,
253
536 V or more)
Slave3
254
n Error Diagnosis and Countermeasure Flow Chart
Are there any power wire No
connections normal?
Yes
No
Is input voltage normal?
Yes
No
Is Inverter PCB assembly
bridge diode joining condition normal?
Yes
No
Inverter PCB LED display error
Yes
Recheck power and installation condition
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
Main Reasons
Main Reasons
1. Input voltage abnormal (T-N, R-S, S-T, T-R)
1. Input voltage abnormal (T-N, R-S,
2. Outdoor unit Inverter PCB assembly dam-
S-T, T-R)
age (input voltage sensing part)
2. Outdoor unit Inverter PCB assembly
3. N phase line disconnection
damage(input voltage sensing part)
3. N phase line disconnection
1. Check R/S/T/N wiring conditions
→ Rewire them if abnormality found.
Check
R~S/S~T / T~R phase voltage is 380 V(-10 %) ~ 415 V(+ 10 %)
R~N/S~N/T~N phase voltage is 220 V(-10 %) ~ 240 V(+ 10%)
→ Check connection condition and wiring if power is
abnormal
Check bridge diode in IGBTM of Inverter PCB
Replace Inverter PCB assembly.
- 115 -
LGE Internal Use Only
099
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