82
15.5.16 H97 (Outdoor Fan Motor – DC Motor Mechanism Locked)
Malfunction Decision Conditions
The rotation speed detected by the Hall IC during fan motor operation is used to determine abnormal fan motor.
Malfunction Caused
Operation stops due to short circuit inside the fan motor winding.
Operation stops due to breaking of wire inside the fan motor.
Operation stops due to breaking of fan motor lead wires.
Operation stops due to Hall IC malfunction.
Operation error due to faulty outdoor unit PCB.
Troubleshooting
YES
NO
When abnormality indication starts again
Turn power supply on and operate fan.
Replace fan motor.
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Does fan rotate smoothly?
Turn off power supply and rotate fan by
hand.
Does it rotate?
CN-MTR2
(WHT)
IC19
3
5
1
10
14
16
W
U
V
FAN MOTOR
MS
CN-MTR1
PCB BOARD
5
4
3
2
1
C173
5V
R105
1k
C176
0.01μ
50V
G5
R111
1k
C177
0.01μ
50V
G5
R120
1k
C175
0.01μ
50V
G5
G5
+
YES
NO
YES
Turn off power supply and
disconnect fan motor CN-MRT2
Check resistance of the motor.
Measure at fan motor connector
CN-MRT1 (1-2, 1-3, 2-3).
Replace outdoor PCB.
NO
Replace fan motor.
YES
NO
U
W
V
Replace fan motor.
Replace fan motor.
NO
Replace outdoor PCB.
Stop the fan motor
YES
Is the resistance normal?
Check the rotation feedback output from
fan motor’s CN-MTR1 output.
Rotate the fan motor manually (by hand)
while measure the voltage at PCB’s
CN-MRT1
-
Between 1(+) and 5(-)
-
Between 2(+) and 5(-)
-
Between 3(+) and 5(-)
Use an inverter check to check on
the power transistor on board.
Do all 6 LED light turn ON and turn
OFF periodically?
Does the voltage at each terminal
becomes 5 and 0Vdc repeatedly?
Connect it to PCB’s CN-MRT2 port.
Turn power ON and run the unit.
connector.
Caution
