LG GB7143**AV Series Service Manual page 70

5. How to check the Fan-Error
(1) ~ July 2007
After sending a signal to the fan, the MICOM checks the BLDC fan motor's lock status. If there is no
feedback signal from the BLDC fan, the fan motor stops for 10 seconds and then is powered again for 15
seconds. To determine that there is a fan motor malfunction, this process is repeated 5 times. If the fan
motor is determined to be defective, the error code will be shown continuously in the display.
At this point, there is no further check of the fan motor.
(2) Aug 2007 ~
After sending a signal to the fan, the MICOM checks the BLDC fan motor's lock status. If there is no
feedback signal from the BLDC fan, the fan motor stops for 10 seconds and then is powered again for 15
seconds. To determine that there is a fan motor malfunction, this process is repeated 3 times. If the fan
motor is determined to be defective, the error code will be shown in the display for 30 minutes.
At this point, the process will be repeated until the fan motor operates normally. If normal operation is
achieved, the error display is erased and the MICOM is reset automatically.
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