70
9-2-3 Indoor fan motor speed detecting error (BLDC fan)
Indoor display
7-SEG DISPLAY
DESCRIPTION
C154
Indoor fan error
LED ON
LED BLINKING
LED OFF
1. Checklist :
1) Is the indoor units fan motor properly connected with the connector(CN72)?
2) Is the AC voltage correct?
2. Troubleshooting procedure
NO
YES
YES
YES
NO
YES
YES
NO
NO
NO
Restart after power off.
Does the fan rotate?
Power o and Separate the Fan motor wire
from CN72 on Indoor PBA
Is there short among
each pin #1~#6 ?
Reassemble the fan wire and input the power again
Is the fan error appeared again?
Terminate the
service
Exchange the Fan
motor
Follow the check procedure of Indoor unit
power supply error check
Exchange the Indoor PBA
Is the voltage of CN72 #1-#3 over 250Vdc?
Is the voltage of CN72
#3-#5 and #3-#6 with in 1Vdc~15Vdc during
the operation?
PBA problem or Motor problem
Change the PBA first and check the operation
Exchange the Fan motor
