LG FM21AH UE3 - Page 78

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Only for training and service purposes
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5. Trouble Shooting
V
+ -
+-
+-
22
40
Max. C/T
C/T
Internal circuit
Over current (14A )
Initial current error
Malfunction of compressor
Blocking of pipe
Low voltage input
Refrigerant, pipe length, blocked, …
Malfunction of current detection circuit.
(Open / Short)
The voltage of “C01N” Is 4.0Vdc(25A) .
Display
code
Title Cause of error Check point & Normal condition
Check Point
1. Check the power source.
2. Check the fan operation is right.
3. Check the current.
4. Check the install condition.
5. Check the internal circuit. (C/T, Diode, Resistor)