LG MULTI V Service Manual page 139

Error No. Error Type
Discharge
CH1501
superheat low
Error diagnosis and countermeasure flow chart
Is there indoor unit
which leaks ref. much
Yes
Is EEV head(Coil)
assembly normally?
Yes
Is 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 40 pls)
Also, big refrigerant flow noise occured
Error Point
Discharge superrheat
is under 3 ℃
(liquid back)
Is SC EEV or
SC circuit leaks?
1)
?
Yes
Change SC EEV or
SC EEV assembly
No
Assemble again or
change EEV head(coiL)
No
Connect EEV connector
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Main Reasons
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
No
Check liquid pipe - gas
pipe direct connection
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Self-diagnosis function