Chigo CMV-50V9A-S, Service Manual

Page: 41 / 50

Malfunction code
：
F3
（
the indoor coil temp sensor fault
）
Malfunction code
：
F4
（
the indoor fan motor fault
）
Shut off the power
Take out the temperature sensor from the indoor PCB, then
check whether the indoor coil temperature sensor’s
resistance is normal.(the range of normal resistance
:1~40 K
N
Replace it .when the indoor coil
temperature sensor has problem.
Y
Connect the sensor with the indoor PCB
again. Check the sensor and the indoor PCB
terminal resistance. The normal value is 0
Ω
N
If the indoor coil temperature
sensor adapter connector is loose.
Change this indoor PCB or repair
this adapter connector
Y
The indoor PCB is bad. please change it .
Shut off the power
Take out the plug from the indoor PCB. Then test the
every winding resistance (the normal value: the main
winding is 273
Ω
.
the auxiliary winding is 343
Ω
) Fig. 6
fi
N
The indoor fan motor is bad,
then please change it
Y
connect the motor plug with the indoor PCB again and
turn on. Then test the feedback terminal to ground
wire voltage whether it is normal (the normal voltage
is increased gradually from 0 to +2.4VDC)
N
The indoor fan motor is bad, then
please change it
Y
The indoor PCB is bad. please
change it
Check the indoor fan whether it is smooth
N
1.If the fan is bad and change it
2.The bolt what fix the indoor fan
is loose. Pls screw it again
3.There are any dirt in the indoor
fan. Pls clean it
Y
Faulty cause
：
1
、
maybe
the indoor coil temp sensor’s
bnc connector plugs is loose or contact ill
;
2 、 the sensor is bad or
the
down-lead is
circuit-break、circuit－short
3、the indoor PCB’s hardware has been damaged
The faulty cause
：
1 、 the fan motor is blocked or turns
abnormally；
2、the motor wire is loose or contacts ill
3、the indoor fan motor has been damaged
4、the indoor PCB is bad