Mitsubishi Electric MCFH-13NV-E4 Service Manual page 43

11-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
doesn't
Outdoor unit
operate
operates in
even in
only Test Run
Test Run
operation.
operation.
Check room
temperature
Refer to D
thermistor.
Refer to "Check of
"Test point
outdoor unit"
diagram and
on page 47 or
voltage" on
48.
page 52.
Flash on and 1-time flash
off at 0.5-
Cause:
second
Outdoor /
interval
Indoor unit
Cause:
• Trouble of
Indoor/
serial signal
Outdoor unit
• Mis-wiring
Refer to E Refer to E
"How to "How to
check mis- check mis-
wiring and wiring and
serial signal serial signal
error (When error (When
outdoor unit outdoor unit
doesn't doesn't
work)" on work)" on
page 49. page 49.
W1 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".
Indoor unit
operates.
Outdoor unit
doesn't operate
normally.
Unit doesn't
Outdoor unit
operate
doesn't
normal
stop even
operation in
if indoor unit
COOL or
stops.
HEAT mode.
Refer to F
Refer to G
"Check of
"Check of
outdoor unit"
R.V. coil"
on page 50.
on page 50.
2-time flash
6-time flash
Cause:
Cause:
Indoor unit
Outdoor unit
• Trouble of
room temp- • Trouble of
erature/
thermistor
indoor coil
in outdoor
temperature
unit
thermistor
Check room
Refer to H
temperature
"Check of
thermistor
outdoor
and indoor
thermistor"
coil tempera-
on page 51.
ture thermis-
tor.
Refer to
"Test point
diagram and
voltage"
on page 52.
Indoor unit
doesn't receive
the signal from
remote controller.
Indoor unit
operates, when
the EMERGENCY
OPERATION
switch is pressed.
Refer to B
"Check of
remote controller
and receiver
P.C. board"
on page 46.
MCHF-24NV
7-time flash
Cause:
Outdoor unit
• Trouble of
outdoor
control
system
Refer the
deicer
P.C. board.
43
OPERATION INDICATOR
lamp on the indoor unit is
flashing on and off.
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 47.