Panasonic CS-HZ25WKE Service Manual page 112

17.4.16 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
When abnormality indication starts again
Turn off power supply and rotate fan by
hand
Does fan rotate smoothly?
YES
Turn power supply on and operate fan.
Does it rotate ?
Measure CN-MRT1 (pin 4 & 5)
Is the DC voltage ~5Vdc?
YES
Stop the fan motor
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(-)
For safety reason and to prevent component
Caution breakdown, always switch off the power
before remove and connect the component.
NO
Replace fan motor
NO
NO
Replace outdoor PCB
FAN
MOTOR
Turn off power supply and
disconnect fan motor CN-MRT2
connector
Check resistance of the motor.
Measure at fan motor connector
CN-MRT1 (1-2, 1-3, 2-3).
YES
Is the resistance normal?
Use an inverter check to check on
the power transistor on board.
Connect it to PCB's CN-MRT2 port.
Turn power ON and run the unit
YES
Do all 6 LED light turn ON and turn OFF
periodically?
Does the voltage at each terminal becomes
5 and 0Vdc repeatedly?
112
CN-MTR2
(WHT)
1
W
3
MS
U
3~
V
5
R403
IC19
1k
1
C414
5V
0.01u
3
50V
CN-MTR1 B1
(RED)
G6
C401
0.1u
25V
B1
G5
NO
Replace fan motor
NO
Replace outdoor PCB
YES
Replace fan motor
NO
Replace fan motor
YES
Replace outdoor PCB
10
14
16