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5. Trouble Shooting
6.11 Check code Trouble shooting CH21
Check Over load condition
- Overcharging of
refrigerant
- Pipe Length
- Condenser is blocked
- Outdoor fan is locked
Is it normal ?
(1 Ph : 230V ±10%
3 Ph : 400V ±10% )
Change Main PCB
Check the wire
connection.(U,V,W)
Is it normal ?
Check the resistance of
comp. (No difference at
each terminal)
Is it normal ?
Yes
Yes
No
Correct
connection
Yes
No
Needs electric work
Check DC link
capacitor Is it normal?
(Refer to belows)
Yes
No
No
Change DC link
capacitor
Or Main PCB
Remove obstruction
Change outdoor fan
or motor
Change refrigerant
No
Change
Compressor
Check the electricity
leakageof the compressor.
(Refer to comp check table)
Check the input power
(Outdoor, Indoor unit)
Is it normal ?
Yes
No
Change
Compressor
Check Flow Chart
❊ Dc link voltage table
Type Non operating Operating
1 Phase
AUUW243D[LUU245HV] PFC DC300V ± 10% DC380V ± 10%
AUUW423D[LUU425HV] PFC DC300V ± 10% DC380V ± 10%
Model
DC Link Voltage
21
DC Peak
• Instant over current
• Over Rated current
• Poor insulation of IPM
• An instant over current in the U,V,W phase
- Comp lock
- The abnormal connection of U,V,W
• Over load condition
- Overcharging of refrigerant
- Pipe length.
• Poor insulation of compressor
Display
code
Title Cause of error Check point & Normal condition