43
(Outdoor LED indication table)
MUZ-A09RV -
MUZ-A12RV -
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation.
E1
E1
Abnormal point
When the converter protective suspension within 1 minute after
start-up of the converter is operated 5 times successively.
Also bus-bat voltage malfunction (140V or less or 400V or
more) within 1 minute after- start-up of the converter has
happened 5 times successively.
When compressor has stopped by over current protection or
start-up failure protection within 1 min. after compressor start-
up 3 times in a row, compressor stops and then restarts 3 min.
later.
When discharge temperature thermistor or fin temperature
thermistor shorts or opens during compressor running,
compressor stops and restarts 3 min. later.
When nonvolatile memory date cannot be read properly,
compressor stops and restarts 3 min. later.
When 19A current flows into power transistor, compressor
stops and restarts 3 min. later,
When discharge temperature thermistor exceeds 116
:
,
compressor stops and restarts 3 min. later.
(Compressor restarts when discharge temperature thermistor
reads 100
:
or below.)
When temperature at heat sink exceeds 88
:
or outdoor
electronic control P.C. board exceeds 67
:
, compressor
stops and restarts 3 min. later.
When indoor coil thermistor exceeds 75
:
, compressor stops
and restarts 3 min. later.
When current from power outlet exceeds 10. A, 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 the converter suspends for protection
•Response abnormal suspension
•Bus-bar voltage abnormal suspension
•Converter over current/over voltage protective suspension
•Converter current detection abnormal suspension
•Converter zero cross abnormal suspension
When discharge temperature has been 50
:
or below for 20
min.
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
min. later' is
repeated
Outdoor unit
operates (at
low
frequency)
Outdoor unit
operates
One flash every
2.5 seconds
NOTE:
For abnormality
location, refer to
'Indoor
troubleshooting
check table' on
page 34.
2 flashes
2.5 seconds OFF
3 flashes
2.5 seconds OFF
4 flashes
2.5 seconds OFF
5 flashes
2.5 seconds OFF
one flash
2-5 seconds OFF
3 flash
2-5 seconds OFF
4 flashes
2-5 seconds OFF
5 flashes
2-5 seconds OFF
8 flashes
2-5 seconds OFF
7 flashes
2-5 seconds OFF
Converter power
system
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.
Converter
protection.
low discharge
temperature
protection
· Refer to
N
'Check of electronic
control P.C.board' on page 52.
· Refer to 'Checking inverter/
compressor on page 47.
· Refer to
I
'Check of outdoor
thermistors' on page 50.
Refer to
A
-
E
in 'How to check
inverter/ compressor' on page 47~ 48.
Replace outdoor electronic control
P.C. board.
· Check refrigerant circuit and
refrigerant amount.
· Refer to
I
'Check of outdoor
thermistor' on page 50.
· 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
I
'Check of outdoor
thermistors' on page 50.
· Refer to
N
'Check of electronic
control P.C.board' on page 52.
· Refer to
P
'Check of LEV' on
page 53.
· Check refrigerant circuit and
refrigerant amount.
<Outdoor electronic control P.C. board>
When switching from forced drive to normal drive
(synchronised operation by a position detectable signal) failed
5 times successively at compressor start-up
Restart-up after suspension when miss start-up or abnormal
position detecting within 10 seconds after start-up.
7 flashes
2.5 seconds OFF
Mis-start up
protection
When the position detectable signal is not input during normal
starting up (synchronised operation by a position detectable
signal) after 10 seconds of compressor operation
8 flashes
2.5 seconds OFF
Position detection
protection
Check and replace as follows.
1 Check the compressor connecting
lead wire between connector and
transistor module.
2 Check inverter P.C.board
(Position detecting circuit transistor
module, Micro computer, etc)
3 Compressor replacement
Refer to
A
~
E
Inverter Compressor
simple check method (page 47~48)
When disconnecting the compressor connector, going to
inverter check mode.
9 flashes
2-5 seconds OFF
Inverter check
mode
· Refer to
A
~
E
Inverter Compressor
simple check method (Page 47~48)
15
16
17
LED
IPM
PFC
flash
Refer to
I
'Check of outdoor
thermistors' on page 50.
