Indoor Unit Dose Not Operate (Different Modes) - Mitsubishi Electric MSC-07RV Service Manual

<MXZ-18RV,MXZ32RV>
The other cases
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.
OPERATION INDICATOR
• 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.
Indoor unit operates.
Outdoor unit dosen't
operate.
Outdoor unit
Outdoor unit
doesn't oper-
operates in
ates even in
only Test
Test Run
Run opera-
operation.
tion.
Refer to
Check room
"F Simple
temperature
check methods
themistor.
for inverter/
compressor" on
page 136.
Refer to T "Mis-wiring or
mis-piping" on page 140,141.
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.
Lighting Frashing
Indoor unit doesn't OPERATION INDICATOR
receive the signal lamp on the indoor unit
from remote
is flashing on and off.
controller.
Outdoor unit
operates in
only Test
Run opera-
tion
1-time flash
Cause:indoor/outdoor unit
connecting
Trouble of mis-wiring
Trouble of the serial signal
Check indoor coil
thermistor. Refer
to "Test point dia-
gram and voltage
on page 142.
Inverter
Compressor
G to K
Transistor module
G to K
See page 136,137.
Compressor
See page 136,137.
P Power supply
See page 139.
Outdoor controll
P. C. board
Operation start
Indoor unit dosen't receive the signal from
remote controller.
Also, OPERATION INDICATOR lamp doesn't
light, when the EMERGENCY OPERATION
switch is pressed.
2-time flash
2.5 second OFF
3-time flash
2.5 second OFF
Cause:indoor unit
2-time-Room temperture/
indoor coil thermi-
stor trouble
3-time-Indoor fan motor
trouble
Refer to A
Check room tempe-
"Check
rature thermistor.
of indoor fan
Refer to "Test point
motor" on
diagram and voltage
page 132.
on page 142.
M Reversing
valve coil.
See page 138.
124
Refer to c "Check of indoor
electronic controll P.C. board"
on page 133.
5-time flash
2.5 second OFF
6-time flash
2.5 second OFF
7-time flash
2.5 second OFF
Cause:Outdoor unit
5-time-Power system abnormality
6-time-Thermistor abnormality
7-time-Control system error
L Outdoor
thermistor
See page 138.
N Outdoor fan
Linear
• High
expansion motor.
pressure
valve
See page 139.
switch
Only
MXZ-32RV
• Low
pressure
switch
• Compressor
thermostat