71
OUTDOOR UNIT
MUZ-G09SV -
MUZ-G12SV -
MUZ-G09SV -
MUZ-G12SV -
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation.
Refer to page 92.
E2
E2
E1
E1
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
ON
OFF
2.5-second OFF
2.5-second OFF
0.5-second ON
0.5-second ON
Abnormal point
When serial signal stops from indoor unit for 60 seconds,
compressor stops and then restarts 3 minutes later.
When compressor has stopped by over current protection
within 1 minute after compressor start-up 3 times in a row,
compressor stops and then restarts 3 minutes later.
When discharge temperature thermistor or fin temperature
thermistor shorts or opens during compressor running,
compressor stops and restarts 3 minutes later.
When nonvolatile memory date cannot be read properly,
compressor stops and restarts 3 minutes later.
When 19A(MUZ-G09SV)/ 29A(MUZ-G12SV) current flows into
power transistor, compressor stops and restarts 3 minutes later.
When discharge temperature thermistor exceeds 116
:
,
compressor stops and restarts 3 minutes later.
(Compressor restarts when discharge temperature thermistor
reads 100
:
or below.)
When temperature at heat sink exceeds 78
:
(MUZ-G09SV)/
80
:
(MUZ-G12SV) or outdoor electronic control P.C. board
exceeds 68
:
(MUZ-G09SV)/ 78
:
(MUZ-G12SV), compressor
stops and restarts 3 minutes later.
When indoor coil thermistor exceeds 75
:
, compressor stops
and restarts 3 minutes later.
When current from power outlet exceeds 8A(MUZ-G09SV)/
9A(MUZ-G12SV), compressor frequency lowers.
When indoor coil thermistor exceeds 55
:
in HEAT mode,
compressor frequency lowers.
When indoor coil thermistor reads 8
:
or below in COOL mode,
compressor frequency lowers.
When discharge temperature thermistor exceeds 111
:
,
compressor frequency lowers.
When defrost thermistor short or open.
w
In this case, compressor continues running.
When power factor of compressor is not detected.
w
In this case, compressor continues running.
When discharge temperature has been 50
:
or below for 20
minutes.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symptom
LED indication
Detection method
Checkpoint
Outdoor unit
does not
operate
'Outdoor unit
stops and
restarts 3
minutes later'
is repeated
Outdoor unit
operates (at
low
frequency)
Outdoor unit
operates
1-time flash every
2.5 seconds
NOTE:
For abnormality
location, refer to
'Indoor
troubleshooting
check table' on
page 69.
2-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
1-time flash
2.5 seconds OFF
3-time flash
2.5 seconds OFF
4-time flash
2.5 seconds OFF
5-time flash
2.5 seconds OFF
6-time flash
2.5 seconds OFF
7-time flash
2.5 seconds OFF
Serial signal
Outdoor power
system
Outdoor
thermistors
Outdoor control
system
Over current
protection
Discharge
temperature
overheat
protection
Fin temperature
thermistor overheat
protection
High pressure
protection
Frequency drop by
current protection
Frequency drop by
high pressure
protection
Frequency drop by
defrosting in COOL
mode
Frequency drop by,
discharge
temperature
protection.
Outdoor
thermistors.
Defrost thermistor.
Power factor
detection
Low discharge
temperature
protection
· Refer to
Q
"How to check mis-
wiring and serial signal error" on
page 83.
· Refer to
M
"Check of power supply"
on page 81.
· Refer to
A
"How to check inverter/
compressor" on page 76.
· Refer to
J
"Check of outdoor
thermistors" on page 79.
Refer to
A
"How to check inverter/
compressor" on page 76.
Replace outdoor electronic control
P.C. board.
· Check refrigerant circuit and
refrigerant amount.
· Refer to
J
"Check of outdoor
thermistors" on page 79.
· Check around outdoor unit.
· Check outdoor unit air passage.
· Check refrigerant circuit and
refrigerant amount.
· Check stop valve.
The unit is normal, but check the
following.
· Check if indoor filters are clogged
· Check if refrigerant is short.
· Check if indoor/outdoor unit air
outlets are short cycled.
Refer to
J
"Check of outdoor
thermistors" on page 79.
Check compressor wiring.
· Refer to
P
"Check of LEV" on
page 82.
· Check refrigerant circuit and
refrigerant amount.
<Outdoor electronic control P.C. board>
LED
flashing
Hybrid
IC
Transistor
module
transformer
OB245--3qxp 02.10.22 4:15 PM Page 71
