Mitsubishi Electric Mr.Slim MSH24WN Service Manual page 32

10-2. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit
Outdoor unit
doesn't
operates in
operate
only Test Run
even in
operation.
Test Run
operation.
Refer to D
Check room
temperature
"Check of
thermistor.
outdoor unit"
Refer to
on page 37.
"Test point
diagram and
voltage" on
page 41.
Flash on and 2-time flash
off at 0.5- Cause:
Indoor unit
second
• Trouble of
intervals
room temp-
Cause:
erature/
Indoor/
indoor coil
Outdoor unit
thermistor
• Mis-wiring
Check room
Refer to G
temperature
"How to check
thermistor
mis-wiring
and indoor
(When
coil thermis-
outdoor unit
tor.
doesn't
Refer to
operate)"
"Test point
diagram and
on page 39.
voltage"
on page 41.
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 E Refer to F
"Check of "Check of
outdoor unit" R.V. coil"
on page 38. on page 38.
4-time flash
3-time flash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
indoor unit
indoor fan
control
motor
system
Refer to A
Replace the
"Check of indoor
indoor fan electronic
motor" control
on page 35. P.C. board.
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 35.
7-time flash
6-time flash
Cause: Cause:
Outdoor unit Outdoor unit
• Trouble of
• Trouble of
thermistor outdoor
in outdoor control
system
unit
Refer to I
Replace the
"Check of deicer
outdoor P.C. board.
thermistor"
on page 40.
32
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 36.
10-time flash
Cause:
Outdoor unit
• Trouble of
low
discharge
temperature
protection
Refer to H
"Check of
LEV"
on page 40.