Mitsubishi Electric Mr. Slim MSZ-FE09NA Service Manual page 24

9-3. INSTRUCTION OF TROUBLESHOOTING
Start
Indoor unit oper-
ates.
Outdoor unit
does not operate.
Outdoor unit Outdoor unit
operates only does not
in Test Run operate even
operation. in Test Run
operation.
Check room Refer to "How
temperature
to check
thermistor.
inverter/com-
Refer to 9-7.
pressor".
"Test point
diagram and
voltage".
POWER lamp
Upper lamp
Flash on and
off at 0.5-sec-
ond intervals
Cause:
Indoor/Outdoor
unit
• Miswiring or
trouble of
serial signal
Refer to 9-6.
"How to
check miswir-
ing and serial
signal error".
POWER lamp: MSZ-FE09/12NA
Upper lamp: MSZ-FE18NA
Indoor unit operates.
Outdoor unit does
not operate normally.
Indoor unit
Unit does not
operates, when
operate nor-
EMERGENCY
mal operation
OPERATION
in COOL or
switch is pressed.
HEAT mode.
Refer to Refer to 9-6.
"Check of R.V. "Check of remote
coil". controller and
indoor elec-
tronic control P.C.
board".
POWER lamp POWER lamp
Upper lamp Upper lamp
2-time fl ash 3-time fl ash
Cause: Cause:
Indoor unit Indoor unit
• Trouble of • Trouble of
room tem- indoor fan
perature / motor
indoor coil
thermistor
Check room Refer to 9-6.
temperature "Check of
thermistor indoor fan
and indoor motor".
coil thermis-
tor. Refer
to 9-7."Test
point diagram
and voltage".
Indoor unit does
OPERATION INDICATOR
not receive the
lamp on the indoor unit is
signal from re-
fl ashing on and off.
mote controller.
Indoor unit does
not operate,
when EMER-
GENCY OPERA-
TION switch is
pressed.
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 9-6. "Check
of indoor electronic
control P.C. board and
indoor fan motor".
POWER lamp POWER lamp
Upper lamp Upper lamp
4-time fl ash 5-time fl ash
Cause:
Cause:
Indoor unit Outdoor unit
• Trouble • Outdoor
of indoor power
unit control system
system abnormality
Replace the Refer to
indoor elec- "How to
tronic control check invert-
P.C. board. er/compres-
sor".
24
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
"Test Run operation" means the
operation within 30 minutes af-
ter EMERGENCY OPERATION
switch is pressed.
Refer to outdoor unit service manual.
POWER lamp POWER lamp
Upper lamp
Upper lamp
6-time fl ash 7-time fl ash
Cause: Cause:
Outdoor unit
Outdoor unit
• Trouble of • Trouble of
thermistor in outdoor con-
trol system
outdoor unit
Refer to Replace the
"Check of inverter P.C.
outdoor board or the
thermistors". outdoor elec-
tronic control
P.C. board.
POWER lamp
Upper lamp
14-time fl ash
Cause:
Outdoor unit
• Other ab-
normality
Check "Flow
chart of the
detailed
outdoor unit
failure mode
recall func-
tion."