14
OCH699
NOTE:
1. The location of LED is illustrated at the right figure. Refer to "10-6. TEST POINT DIAGRAM".
2. LED is lighted during normal operation.
The blinking frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the blinking frequency is “2”.
ON
OFF
2.5-second OFF
2.5-second OFF
0.5-second ON
0.5-second ON
LED
Blinking
ĺ
Inverter P.C. board
10-2. TROUBLE SHOOTING CHECK TABLE
SUZ-KA09NA(H)2.MX
SUZ-KA12NA(H)2.MX
SUZ-KA15NA(H)2.MX
No. Symptoms
LED
indication
check
code
Abnormal point/ Condition
Condition
Remedy
1
Outdoor
unit does not
operate.
1-time blink
every
2.5 seconds
UP
Outdoor power system
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
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2
U3
Outdoor thermistors
Discharge temperature thermistor shorts, or opens during com-
pressor running.
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F
Check of outdoor thermistors”.
U4
Fin temperature thermistor, defrost thermistor, P.C. board
temperature thermistor, outdoor heat exchanger
temperature thermistor or ambient temperature thermistor
shorts, or opens during compressor running.
3
FC Outdoor control system
Nonvolatile memory data cannot be read properly.
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4
6-time blink
2.5 seconds
OFF
E8
E9
Serial signal
The communication fails between the indoor and outdoor unit for
3 minutes.
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abnormality is displayed again.
5
11-time
blink
2.5 seconds
OFF
UE
Stop valve/Closed valve
Closed valve is detected by compressor current.
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6
16-time
blink
2.5 seconds
OFF
PL
Outdoor refrigerant
system abnormality
A closed valve and air trapped in the refrigerant circuit are
detected based on the temperature sensed by the indoor and
outdoor thermistors and the current of the compressor.
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circuit”.
7
'Outdoor unit
stops and
restarts
3 minutes
later' is
repeated.
2-time blink
2.5 seconds OFF
Overcurrent protection
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How to check inverter/
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8
3-time blink
2.5 seconds OFF
Discharge temperature
overheat protection
Temperature of discharge temperature thermistor exceeds
116°C, compressor stops. Compressor can restart if discharge
temperature thermistor reads 100°C or less 3 minutes later.
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Check of LEV”.
9
4-time blink
2.5 seconds OFF
Fin temperature/P.C.
board temperature therm-
istor
overheat protection
Temperature of fin temperature thermistor on the heat sink
exceeds 72 to 86°C or temperature of P.C. board temperature
thermistor on the inverter P.C.board exceeds 72 to 85°C.
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Check of outdoor fan motor”.
10
5-time blink
2.5 seconds OFF
High pressure protection
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
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11
8-time blink
2.5 seconds OFF
Compressor synchronous
abnormality
The waveform of compressor current is distorted.
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How to check inverter/
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12
10-time blink
2.5 seconds OFF
Outdoor fan motor
Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan start-up.
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Check of outdoor fan motor”.
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L
Check of inverter P.C. board”.
13
12-time blink
2.5 seconds OFF
Each phase current
of compressor
Each phase current of compressor cannot be detected normally.
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L
Check of inverter P.C. board”.
14
13-time blink
2.5 seconds OFF
DC voltage
DC voltage of inverter cannot be detected normally.
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How to check inverter/
compressor”.
15
Outdoor unit
operates.
1-time blink
2.5 seconds OFF
Frequency drop by
current protection
When the input current exceeds approximately
7A(KA09)/8A(KA12)/9A(KA15), compressor
The unit is normal, but check the following.
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circulation is short cycled.
16
3-time blink
2.5 seconds OFF
Frequency drop by
high pressure protection
Temperature of indoor coil thermistor exceeds 131 °F [55 °C] in
HEAT mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL mode
Indoor coil thermistor reads 46 °F [8 °C] or less in COOL mode,
compressor frequency lowers.
17
4-time blink
2.5 seconds OFF
Frequency drop by
discharge temperature
protection
Temperature of discharge temperature thermistor exceeds 232
°F [111 °C], compressor frequency lowers.
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Check of outdoor thermistors”.
18
7-time blink
2.5 seconds OFF
Low discharge tempera-
ture protection
Temperature of discharge temperature thermistor has been 122
°F [50 °C] or less for 20 minutes.
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19
8-time blink
2.5 seconds OFF
PAM protection
PAM: Pulse Amplitude
Modulation
The overcurrent flows into IGBT (Insulated Gate Biopolar
transistor:TR821) or the bus-bar voltage reaches 320 V 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.
Zero cross detecting
circuit
Zero cross signal for PAM control cannot be detected.
20
9-time blink
2.5 seconds OFF
Inverter check mode
The connector of compressor is disconnected, inverter check
mode starts.
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correctly connected.
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How to check
inverter/compressor".
