LG Single A Svc Manual page 81

5. Trouble Shooting
6.18 Check code Trouble shooting CH40
Display
Title
code
C/T
40
Internal circuit
Check Flow Chart
Check the input power
AC230V
(Outdoor, Indoor unit)
Is it normal ?
( 230V±10%)
Yes
Check "C01N"
Is it normal (4.0Vdc )?
Yes
Check Check TRANS
Is it normal?
Yes
Change main PCB
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Only for training and service purposes
Cause of error
• Initial current error
No
Correct connection
No
Change Main PCB
No
Change TRANS
- 80 -
Check point & Normal condition
• Malfunction of current detection circuit.
(Open / Short)
• The voltage of "C01N" Is 4.0Vdc (25A) .
TRANS
C01N
V
LGE Internal Use Only