Mitsubishi Electric MSC-C07TV Service Manual page 49

11-2. Instruction of troubleshooting
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
operates in
only Test Run
operation.
Check room
temperature
thermistor.
Refer to
"Test point
diagram and
voltage" on
page 57.
Flash on and
off at
0.5-second
intervals
Cause:
Indoor/
Outdoor unit
• Mis-wiring
Refer to E "How to check
mis-wiring and serial signal
error(When outdoor unit
doesn't work)"
on page 56. W1.
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".
W2. This indication is only for MUH-C07/C09/C12TV -
Start
Outdoor unit
Indoor unit
doesn't
operates, when
operate
the EMERGENCY
even in
OPERATION
Test Run
switch is pressed.
operation.
Refer to B
"Check of
Refer to D
remote controller
"Check of
and power
outdoor unit"
monitor, receiver
on page 54
P.C. board"
and 55.
on page 53.
1-time flash
2-time flash
Cause:
Cause:
Indoor unit
Indoor/
• Trouble of
Outdoor unit
room temp-
• Trouble of
erature/
serial signal
indoor coil
thermistor
Check room
temperature
thermistor
and indoor
coil thermis-
tor.
Refer to
"Test point
diagram and
voltage"
on page 57.
Indoor unit
OPERATION INDICATOR
doesn't receive
lamp on the indoor unit is
the signal from
flashing on and off.
remote controller.
Indoor unit
doesn't operate,
when the
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor /
outdoor
connecting wire.
2. Refer to C
"Check of indoor
electronic control
P.C. board"
on page 54.
W2.
3-time flash
6-time flash
Cause:
Cause:
Indoor unit
Outdoor unit
• Trouble of
• Trouble of
indoor fan
thermistor
motor
in outdoor
unit
Refer to A
Check defrost
"Check of
thermistor.
indoor fan
Refer to
motor"
"Test point
on page 53.
diagram and
voltage" on
page 58.
.
E1
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