117
18.4.16 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
FAN MOTOR
CN-MTR2
WHT
10
1
W
MS
3
U
5
V
14
16
IC19
CN-MTR1
1
2
R105
1k
3
4
5
5V
R111
R120
1k
1k
+
C173
C175
0.01μ
50V
G5 G5 G5
C177 C176
0.01μ
0.01μ
50V
50V
G5
PCB
BOARD
Replace
fan
motor.
Replace
outdoor
PCB.
Replace
fan
motor.
Replace
fan
motor.
Replace
outdoor
PCB.
Does
it
rotate?
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.
Do
all
6
LED
light
turn
ON
and
turn
OFF
periodically?
Does
the
voltage
at
each
terminal
becomes
5
and
0Vdc
repeatedly?
U
NO
YES
NO
YES
NO
YES
NO
YES
When abnormality indication starts again
Turn off power supply and rotate fan by
hand.
Caution
For safety reason and to prevent
component breakdown, always switch
off the power before remove and
connect the component.
Does fan rotate smoothly?
NO
Replace fan motor.
YES
Turn power supply on and operate fan.
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).
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(-)
To Next Page
Loading...
Need help?
General
