Mitsubishi Electric MSZ-AP25VG-E1 Service Manual page 32

10-3. INSTRUCTION OF TROUBLESHOOTING
1. Check of the unit.
Start
Indoor unit operates.
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 10-
pressor".
7. "Test point
diagram and
voltage".
Upper lamp Upper lamp
Blink on and 2-time blink
off at 0.5-sec- Cause:
ond intervals Indoor unit
Cause: • Trouble
Indoor/Outdoor of room
unit temperature
• Miswiring or / indoor coil
trouble of se- thermistor
rial signal
Refer to 10- Check room
6. "How to temperature
check mis- thermistor
wiring and and indoor
serial signal coil thermis-
error". tor. Refer to
10-7."Test
point diagram
and voltage".
OBH788C
NOTE: The indoor unit does not operate by smartphone, refer to 10-3.2."Check of Wi-Fi Interface".
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 10-6.
"Check of R.V. "Check of remote
coil". controller and
indoor electronic
control P.C. board".
Upper lamp
Upper lamp
4-time blink
3-time blink
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble
• Trouble of
of indoor
indoor fan
unit control
motor
system
Refer to 10- Replace the
6. "Check indoor elec-
of indoor fan tronic control
motor". P.C. board.
Indoor unit does
OPERATION INDICATOR
not receive the
lamp on the indoor unit is
signal from re-
blinking ON and OFF.
mote controller.
Indoor unit does
not operate, when
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor/out-
door connecting wire.
(Check if the power is
supplied to the indoor
unit.)
2. Refer to 10-6. "Check
of indoor P.C. board
and indoor fan motor".
Upper lamp
Upper lamp
6-time blink
5-time blink
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Outdoor
thermistor in
power sys-
outdoor unit
tem abnor-
mality
Refer to Refer to
"How to "Check of
check outdoor ther-
inverter/com- mistors".
pressor".
32
"Test Run operation" means the
operation within 30 minutes af-
ter EMERGENCY OPERATION
switch is pressed.
If blinking of OPERATION INDI-
CATOR lamp cannot be checked,
it can be checked with failure
mode recall function.
Refer to outdoor unit service manual.
Upper lamp Upper lamp
7-time blink 14-time blink
Cause: or more
Outdoor unit Cause:
• Trouble of Outdoor unit
outdoor con- • Other ab-
trol system normality
Check "Flow
Replace the
chart of the
inverter P.C.
detailed
board or
outdoor unit
the outdoor
failure mode
electronic
recall func-
control P.C.
tion."
board.