42
1. Troubleshooting check table
(Indoor unit troubleshooting check table)
MSZ-A09RV -
MSZ-A12RV -
E1
E1
POWER
flash
· Flashing of the operation indicator lamp (on the left-hand side) indicates possible abnormalities.
· The operation indicator lamp (on the left-hand side) is lighting during normal operation.
No.
1
w
2
w
3
5
6
7
Symptom
Operation indicator lamp
Abnormal point
Detection method
Checkpoint
Outdoor unit
does not
operate
repeated flashes
every 0.5 seconds
One flash
2.5 seconds OFF
2 flashes
2.5 seconds OFF
5 flashes
2.5 seconds OFF
Mis-Wiring
Serial signal
Outdoor power
system
6 flashes
2.5 seconds OFF
Outdoor
thermistors
7 flashes
2.5 seconds OFF
Outdoor control
system
Indoor coil
thermistor
Auxiliary indoor
coil thermistor
Room
temperature
thermistor
When indoor electronic control p.c. board does not
receive serial signals for 4 to 5 seconds with
OPERATION/STOP button of remote controller ON
and 52C relay ON for the first time,
NOTE: In case of serial signal error, mis-wiring
indication will appear by turning power off and
then turning it back on.
When indoor electronic control p.c. board does not
receive serial signals from outdoor unit for 4 to 5
seconds,
Indoor electronic control p.c. board constantly
detects resistance every 8 seconds.
When thermistor shorts or opens.
When compressor has stopped due to over current
protection or start-up failure protection 3 times in a
row within 1 min. after start-up.
<Thermistor short>
Thermistors are abnormal when they short after
compressor start-up.
<Thermistor open>
Thermistors are abnormal when they open after
compressor start-up.
However, discharge temperature thermistor is
abnormal when open circuit is detected more than
10 min. after compressor start-up.
When nonvolatile memory data cannot be read properly
on outdoor control P.C. board, outdoor unit stops and
restarts 3 minutes later,
· Shortage of
refrigerant
· Outdoor electronic
control p.c. board
Refer to
I
"Check
of outdoor
thermistors" on
page 50.
Refer to the
characteristics of
indoor coil thermistor,
auxiliary indoor coil
thermistor, and room
temperature.
thermistor on page
Refer to "How to
check
inverter/compressor"
on page 47.
Replace outdoor
electronic control P.C.
board.
Refer to 'Checking
serial signal error' on
page 44.
w
4
3 flashes
2.5 seconds OFF
Indoor fan motor.
When rotational frequency feedback signal is not
emit during 12-second indoor fan operation.
Refer to
F
"Check of
indoor fan motor" on
page 49.
8
12 flashes
2.5 seconds OFF
Converter power
system
When the converter protective suspension within 1
minute after start-up of the converter is operated 5
times successively.
Also bus-bar voltage malfunction (140V or less or 400V
or more) within 1 minute after start-up of the converter
has happened 5 times successively.
Refer to
I
"Check of
inverter P.C.board" on
page 50.
w
When the indoor unit has started operation and the above detection method has detected an abnormality (the first detection
after the power ON), the electronic control P.C. board turns OFF the 52C and the indoor fan motor with the operation
indicator lamp lighting.
When the 52C and the indoor fan motor are turned ON again 3 minutes later and the same abnormality is detected (a
second detection of the above abnormality after the power ON), the control P.C. board turns OFF the 52C and the indoor fan
motor with the operation indicator lamp flashing.
However, the first detection is cleared in case the power is turned OFF after the first detection.
