Indoor unit dose not operate.(different modes )
• When you try to operate two or more indoor units with one outdoor unit simultaneously, one for the cooling and the other
for heating, the operation mode of the indoor unit that operates earlier is selected. The other indoor units that will start the
operation later cannot operate, indicating as shown in the figure below. In this case, please set all the indoor units to the
same operation mode.
• When indoor units starts the operation while the defrosting of outdoor unit is being done, it takes a few minutes (max.10
minutes) to blow out the warm air.
• In the heating operation, though indoor unit that dose not operate may get warm or the sound of refrigerant flowing may
be heard, they are not malfunction. The reason is that the refrigerant continuously flows into it.
124
<MXZ-18RV,MXZ32RV>
The other cases
OPERATION INDICATOR
Lighting
Frashing
Indoor unit operates.
Outdoor unit dosen't
operate.
OPERATION INDICATOR
lamp on the indoor unit
is flashing on and off.
Operation start
Outdoor unit
operates in
only Test
Run opera-
tion.
NOTE1:In case of serial signal
error, the mis-wiring
indication will apper by
turning the power off and
turning it back on.
NOTE2:Enclosed by the
broken line are the indoor
unit related parts.
Inverter
Compressor
G
to
K
Compressor
See page 136,137.
Check indoor coil
thermistor. Refer
to "Test point dia-
gram and voltage
on page 142.
Refer to
T
"Mis-wiring or
mis-piping" on page 140,141.
Indoor unit dosen't receive the signal from
remote controller.
Also, OPERATION INDICATOR lamp doesn't
light, when the EMERGENCY OPERATION
switch is pressed.
1-time flash
2-time flash
2.5 second OFF
2.5 second OFF
3-time flash
G
to
K
Transistor module
See page 136,137.
L
Outdoor
thermistor
See page 138.
M
Reversing
valve coil.
See page 138.
• High
pressure
switch
Only
MXZ-32RV
• Low
pressure
switch
• Compressor
thermostat
Linear
expansion
valve
N
Outdoor fan
motor.
See page 139.
P
Power supply
See page 139.
Outdoor controll
P. C. board
Indoor unit doesn't
receive the signal
from remote
controller.
Outdoor unit
doesn't oper-
ates even in
Test Run
operation.
Check room
temperature
themistor.
Refer to
"
F
Simple
check methods
for inverter/
compressor" on
page 136.
Outdoor unit
operates in
only Test
Run opera-
tion
Cause:indoor/outdoor unit
connecting
Trouble of mis-wiring
Trouble of the serial signal
Cause:indoor unit
2-time-Room temperture/
indoor coil thermi-
stor trouble
3-time-Indoor fan motor
trouble
Cause:Outdoor unit
5-time-Power system abnormality
6-time-Thermistor abnormality
7-time-Control system error
Refer to
c
"Check of indoor
electronic controll P.C. board"
on page 133.
Refer to
A
"Check
of indoor fan
motor" on
page 132.
Check room tempe-
rature thermistor.
Refer to "Test point
diagram and voltage
on page 142.
6-time flash
2.5 second OFF
5-time flash
2.5 second OFF
7-time flash
2.5 second OFF