Indoor Fan Motor Speed Detecting Error (Bldc Fan) - Samsung AQV09UWLNXSA Service Manual

12-2-6 Indoor fan motor speed detecting error (BLDC fan)

Indoor display
1.Checklist :
1) Is the indoor units fan motor properly connected with the connector(CN72)?
2) Is the AC voltage correct?
Restart a er power off.
Does the fan rotate?
YES
Reassemble the fan wire and input the power
again
Is the fan error appeared again?
YES
Is the voltage of CN72 #1-#3 over
250Vdc
YES
Is the voltage of CN72 #3-#5 and
#3-#6 with in 1Vdc~15Vdc during
the opera on?
YES
PBA problem or Motor problem
Change the PBA first and check the opera on
Exchange the Fan motor
12-7
○ ○ ⊙
NO
Indoor fan error
NO
Power off and Separate the Fan motor wire from
CN72 on Indoor PBA
Is there short among each pin
#1~#6
NO
Terminate the
service
NO
Follow the check procedure of Indoor unit power
supply error check
NO
Exchange the Indoor PBA
YES
Exchange the Fan
motor