Mitsubishi Electric MCFH-13NV-E3 Service Manual page 27

11-2. Instruction of troubleshooting
Indoor unit
operates. Outdoor
unit doesn't
Outdoor unit Outdoor unit
operates in doesn't
only Test operate even
Run in Test Run
operation. operation.
Refer to
Check room
"Check of
temperature
outdoor unit"
thermistor.
on page 31.
When the remote controller
is pressed or when the
EMERGENCY OPERATION
switch is pressed, the fan
does not rotate with
OPERATION INDICATOR
Refer to "Check of indoor
A
fan motor" on page 30.
Indoor unit
doesn't receive
the signal from
remote
controller.
Refer to
B
"Check of
receiver P.C.
board" on
page 30.
1-time flash
D
Cause:indoor/outdoor unit
connecting
Trouble of mis-wiring
(
Trouble of the serial signal
Refer to
E
"How to check mis-
wiring and signal
error
(when outdoor unit
doesn't work)"
on page 32.w1
Start
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
2-time flash
2.5-second OFF
Cause:Indoor unit
2-time-Room
temperature/In
door coil
thermistor
trouble
Check indoor coil
thermistor. Refer to "Test
point diagram and
voltage" on page 33.
w1<The case of the trouble of the serial signal>
When the power is turned off and then turned
on again, the indication shows "the trouble
of mis-wiring".
27
Indoor unit doesn't
receive the signal from
remote controller.
Also, OPERATION
INDICATOR lamp doesn't
flash, when the
EMERGENCY
OPERATION switch is
Refer to "Check of
C
indoor electronic control
P.C. board" on page 31.
6-time flash
2.5-second OFF
Cause:outdoor unit
6-time-Replace the
defrost thermistor
Check room temperature
thermistor. Refer to "Test
point diagram and
voltage" on page 33.