LG MULTI V 5 Manual Book page 69

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