Mitsubishi Electric MUZ-FA25VA-E1 Service Manual page 43

Mitsubishi ilmalämpöpumput huoltaa ja korjaa: Jäähdytinpalvelu RefGroup Oy
11-3. Instruction of troubleshooting
Start
Indoor unit
operates.
Outdoor unit
doesn't
operate.
Outdoor unit Outdoor unit
operates in doesn't
only Test Run operate
operation. w
even in
Test Run
operation. w
Check room
Refer to 11-6.A
temperature
"How to check
thermistor.
inverter/
Refer to
compressor".
"Test point
diagram and
voltage".
All lamps POWER lamp
Flash on and off
Flash on and
at 0.5-second
off at
intervals
0.5-second
Cause:
intervals
Indoor unit
Cause:
• The horizontal
Indoor/
vane is not
Outdoor unit
installed
• Mis-wiring or
correctly.
trouble of
serial signal.
Refer to Refer to 11-6.o
"Check of "How to check
installation of of mis-wiring
the horizontal and serial
vane". signal error
(when
outdoor unit
doesn't work)".
Indoor unit
Indoor unit operates.
doesn't receive
Outdoor unit doesn't
the signal from
operate normally.
remote controller.
Unit doesn't Indoor unit
operates, when
operate
EMERGENCY
normal
operation in OPERATION
switch is pressed.
COOL or
HEAT mode.
Refer to
Refer to 11-6.H
"Check of
"Check of
remote controller
R.V. coil".
and receiver
P.C. board".
POWER lamp
POWER lamp
2-time flash
3-time flash
Cause:
Cause:
Indoor unit
Indoor unit
• Trouble of
• Trouble of
room temp-
indoor fan
erature/
motor
indoor coil
thermistor
Refer to
Check room
"Check of
temperature
indoor fan
thermistor
motor".
and indoor
coil thermis-
tor.
Refer to
"Test point
diagram and
voltage".
www.ilmalämpöpumput.com
If blinking of OPERATION
INDICATOR lamp cannot
be checked, it can be
checked with failure mode
recall function.
OPERATION
INDICATOR
lamp on the indoor
unit is flashing on
and off.
Indoor unit
doesn't operate,
when
EMERGENCY
OPERATION
switch is pressed.
1. Check indoor / outdoor
connecting wire.
(Check if the power
is supplied to the
indoor unit.)
2. Refer to
"Check of indoor
electronic control
P.C. board and indoor
fan motor".
Left lamp
POWER lamp
of AREA lamp
5-time flash
4-time flash
Cause:
Cause:
Outdoor unit
Indoor unit
• Outdoor
• Trouble of
power
indoor unit
system
control
abnormality
system
Replace the Refer to 11-6.A
"How to check
indoor
inverter/
electronic
control compressor".
P.C. board.
26
w As for "Test run opearation",
refer to indoor unit service
manual OB371.
OPERATION
INDICATOR
lamp on the indoor
unit stays off.
PLASMA/WASH lamp
2-time flash
cause:
Indoor unit
• Trouble of PLASMA
DEODORIZNG power
control or PLASMA AIR
PURIFYING power
control
Replace the indoor
electronic control P.C.
board.
As for indoor unit,
refer to service manual OB371.
POWER lamp
POWER lamp
7-time flash
6-time flash
Cause:
Cause:
Outdoor unit
Outdoor unit
• Trouble of
• Trouble of
outdoor
thermistor
control
in outdoor
system
unit
Refer to 11-6.G Replace
"Check of inverter P.C.
outdoor board.
thermistors".
POWER lamp
14-time flash
Cause:
Outdoor unit
• Other
abnormality
Check 11-2.2.
"Flow chart of
the detailed
outdoor unit
failure mode
recall function."