47
ON
OFF
2.5-second OFF
2.5-second OFF
NOTE 1. The location of LED is illustrated at the right figure.
2. LED lights up during normal operation. Refer to page 66.
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
<Inverter P.C. board>
LED
Flashing
Abnormal point
When compressor has stopped by over current protection
within 1 minute 3 times in a row after compressor start-up, unit
stops.
When discharge temperature thermistor, fin temperature
thermistor or defrost thermistor shorts or opens during
compressor running, compressor stops.
When nonvolatile memory data cannot be read properly,
compressor stops.
When 13A(SUZ-A09VR.TH)/ 20A(SUZ-A12VR.TH) 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 83
:
or inverter P.C.
board exceeds 79
:
, compressor stops and restarts 3 minutes
later.
When indoor coil thermistor exceeds 70
:
.
When the defrost thermistor exceeds 70
:
in COOL mode.
When current from power outlet exceeds 8A(SUZ-A09VR.TH)/
9A(SUZ-A12VR.TH), 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 discharge temperature has been 50
:
or below for 20
minutes.
No.
1
2
3
5
6
7
8
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'.
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
7-time flash
2.5 seconds OFF
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.
Low discharge
temperature
protection
· Check stop valve.
· Reconnect connector.
· Refer to
A
"How to check inverter/
compressor" on page 52.
· Refer to
G
"Check of outdoor
thermistors" on page 54.
· Check stop valve.
· Reconnect connector.
· Refer to
A
"How to check inverter/
compressor" on page 52.
Replace inverter P.C. board.
· Check refrigerant circuit and
refrigerant amount.
· Refer to
G
"Check of outdoor
thermistors" on page 54.
· Refer to
L
"Check of LEV" on page
56.
· Check around outdoor unit.
· Check outdoor unit air passage.
· Refer to
I
"Check of outdoor fan
motor" on page 55.
· 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
L
"Check of LEV" on
page 56.
· Check refrigerant circuit and
refrigerant amount.
Refer to
A
"How to check inverter/
compressor" on page 52.
When the bus-bar voltage of inverter cannot be detected
normally.
Bus-bar voltage
8-time flash
2.5 seconds OFF
Compressor
sinusoidal current
When the waveform of compressor current is distorted.
· Check stop valve.
· Reconnect connector.
· Refer to
A
"How to check inverter/
compressor" on page 52.
8-time flash
2.5 seconds OFF
PAM protection
When the overcurrent flows into IGBT or when the bus-bar
voltage reaches 300V or more, PAM stops and restarts.
This is not malfunction.
PAM protection will be activated in
the following cases;
1
Instantaneous power voltage drop
(Short time power failure)
2
When the power supply voltage is
high.
9-time flash
2.5 seconds OFF
Inverter check
mode
When the connector of compressor is disconnected, inverter
check mode starts.
Check if the connector is correctly
connected.
Refer to
A
"How to check inverter/
compressor" on page 52.
4
9
15
0.5-second ON
0.5-second ON
12-2-1. Troubleshooting check table (1)
SUZ-A09VR.TH SUZ-A12VR.TH
OC304A --2qxp 04.6.29 8:34 AM Page 47
