Friedrich MD24Y3J Svc Manual page 53

Display
Title
code
Indoor BLDC Fan Motor
10
Lock
Check Point
Check the PCB during the Power on
1. Check the Voltage Red line to Black line
' The Voltage is about [input voltage x 1.414]
' if the Voltage does not compair to above Voltage,
' Check the power input
' Replace the PCB & Motor
2. Check the Voltage Black line to White
' the Voltage is DC 15V
' Check the Power input
' Replace the motor
Check the Motor
1. Check the shaft
' if the shaft is not turn smoothly, the Motor Power IC is defected
' replace the motor
2. Check the motor resistance(if the shaft is turn smoothly, check the resistance)
' Check Red line to Black line, Blue line to Black line
' The resistance should infinite
' replace the motor
Only for training and service purposes
Cause of error
The Fan is not operated
properly
White
Yellow
Blue Black Red
Check point & Normal condition
Check the Indoor fan locking
Fan motor
connector
Tester
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