LG Multi V 5 - Page 69

136 137
_TROUBLE SHOOTING GUIDE BOOK _
- 152 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
1. Wrong operation of 4way valve because of sludge
etc. inflow
2. No pressure difference because of compressor
fault
3. Wrong installation of In/outdoor common pipe
4. Defect of 4way valve
Error
No.
Error Type Error Point Main Reasons
Function error of 4way
(reversing valve) in Main or
Slave outdoor units
Function error of outdoor
4way (reversing valve)
151*
Master
1511
n Error diagnosis and countermeasure flow chart
Is 4-Way valve connecter
connection are properly
connected?
No
Reconnect it
After reset, can we
check supply voltage at PCB
when starting heating
mode operation****
No
Is 4 way valve coil connected
to 4 way valve normally?**
ø
No
Is 4 Way valve coil
resistance normal?*
Change 4 Way valve coil
No
Yes
In case of more than
2 units, does master outdoor
unit recognize as more
than 2 units? ***
Refer to CH 51 & make measure
Yes
Is compressor working
normally?
No
Check and replace compressor,
Magnet switch, corresponding PCB
[refer electric component part]
Yes
Re-insert 4 way valve coil
Replace outdoor unit PCB
Yes
Yes
No
Replace 4 way valve*****
After opposite
mode operation to present
mode, is the same error
occurred again?
If the same error is occurred in
near future replace 4way valve
Yes
Yes
No
Error No. Error Type Error Point Main Reasons
151*
Function error
of outdoor 4way
(reversing valve)
Function error of
4way (reversing
valve) in Main or
Slave outdoor units
1. Wrong operation of 4way valve because of
sludge etc. inflow
2. No pressure difference because of com
-
pressor fault
3. Wrong installation of In/outdoor common
pipe
4. Defect of 4way valve
▒
Error Diagnosis and Countermeasure Flow Chart
- 151 -
Copyright ©2017 LG Electronics. Inc. All right reserved.
Only for training and service purposes
LGE Internal Use Only
Check liquid bypass
1. Individual power of indoor unit is
open during operation
2. Indoor unit EEV fault(ref. leak
much)
3. Indoor unit EEV connector discon-
nected.
4. SC EEV fault(ref. leak much)
5. Liquid pipe – gas pipe direct con-
nection
Error No. Error Type Error Point Main Reasons
Discharge
superrheat is
under 3℃
(liquid back)
Discharge superheat low
CH150
Is EEV head(Coil)
assembly normally?
Change EEV assembly
Yes
Yes
Yes
No
Yes
No
No
No
Is EEV connector
connected normally?
Is there indoor unit
which leaks ref.
much
1)
?
Is SC EEV or SC
circuit leaks?
Change SC EEV or SC EEV
assembly
Assemble again or change
EEV head(coiL)
Connect EEV connector
Check liquid pipe
– gas pipe direct connection
* Measuring input voltage
* Noise filter wiring
R(L1) S(L2) T(L3) N
1) Ref. leakage much
: Both Pipe in, pipe out temp. is under 10℃
during unit is off(EEV 40pls)
Also, big refrigerant flow noise occured
n Error diagnosis and countermeasure flow chart
Error No. Error Type Error Point Main Reasons
150*
Discharge
superheat low
Discharge super
-
rheat is under 3℃
(liquid back)
Check liquid bypass
1. Individual power of indoor unit is open
during operation
2. Indoor unit EEV fault(ref. leak much)
3. Indoor unit EEV connector disconnected.
4. SC EEV fault(ref. leak much)
5. Liquid pipe - gas pipe direct connection
▒
Error Diagnosis and Countermeasure Flow Chart
Basic Part
Multi V 5
Intorduction
Trouble Shooting
Function Control
Back
Basic PartBasic PartBasic PartBasic Part