LG Single "A" Service Manual page 99

5. Trouble Shooting
6.15 Check code Trouble shooting CH26, CH27
Display
Title
code
DC Compressor
26
Position
PSC Fault
27
PFC Fault
Check Flow Chart
Check the wire
connection.(U,V,W)
Is it normal ?
Yes
Check the resistance of
comp. (No difference at
each terminal)
Is it normal ?
Yes
Check the electricity
leakageof the compressor.
(Refer to comp check table)
Is it normal ?
Yes
Check the input power
(Outdoor, Indoor unit)
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Only for training and service purposes
Cause of error
• Compressor
position detect error
• Over current at
"IGBT"/PFC module
No
Correct
connection
No
Change
Compressor
❊ Dc link voltage table
No
Change
Model
Compressor
1 Phase
3 Phase
- 98 -
Check point & Normal condition
• Check the connection of comp wire "U,V,W"
• Malfunction of compressor
• Check the component of "IPM", detection parts.
• Check the component of "IGBT" /PFC module.
• Check the components.
Is it normal ?
(1 Ph : 230V ±10%
3 Ph : 400V ±10% )
Yes
Check DC link
capacitor Is it normal?
(Refer to belows)
Yes
Check Over load condition
- Overcharging of
refrigerant
- Pipe Length
- Condenser is blocked
- Outdoor fan is locked
No
Change Main PCB
Type Non operating
AUUW126C PSC DC300V ¡¾ 10%
AUUW186C PSC DC300V ¡¾ 10%
AUUW246D PFC DC300V ¡¾ 10%
AUUW306D PFC DC300V ¡¾ 10%
AUUW366D PFC DC300V ¡¾ 10%
AUUW426D PFC DC300V ¡¾ 10%
AUUW486D PFC DC300V ¡¾ 10%
AUUW606D PFC DC300V ¡¾ 10%
AUUW368D PSC DC540V ¡¾ 10%
AUUW428D PFC DC540V ¡¾ 10%
AUUW488D PFC DC540V ¡¾ 10%
AUUW608D PFC DC540V ¡¾ 10%
No
Needs electric work
No
Change DC link
capacitor
Or Main PCB
Remove obstruction
Change outdoor fan
or motor
Change refrigerant
DC Link Voltage
Operating
DC280V ¡¾ 10%
DC280V ¡¾ 10%
DC380V ¡¾ 10%
DC380V ¡¾ 10%
DC380V ¡¾ 10%
DC380V ¡¾ 10%
DC380V ¡¾ 10%
DC380V ¡¾ 10%
DC500V ¡¾ 10%
DC680V ¡¾ 10%
DC680V ¡¾ 10%
DC680V ¡¾ 10%
LGE Internal Use Only