16
OCH688A
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
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.
• Reconnect connector of compressor.
• Refer to “10-5.
A
How to check
inverter/compressor".
• Check stop valve.
2
U3
Outdoor thermistors Discharge temperature thermistor shorts, or opens during
compressor
running.
• Refer to “10-5.
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
6-time blink
2.5 seconds
OFF
FC
Outdoor control system Nonvolatile memory data cannot be read properly. • Replace inverter P.C. board.
4
E8
/
E9
Serial signal The communication fails between the indoor and outdoor unit for 3
minutes.
• Check indoor/outdoor connecting
wire.
• Replace indoor or outdoor P.C.board
if abnormality is displayed again.
5
11-time blink
2.5 seconds
OFF
UE
Stop valve/
Closed valve
Closed valve is detected by compressor current. • Check stop valve.
6
WLPHÀDVK
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.
• Check for a gas leak in a connecting
piping, etc.
• Check stop valve.
• Refer to “10-5.
O
Check of outdoor
fan motor".
7
'Outdoor
unit stops
and
restarts 3
minutes
later' is
repeated.
2-time blink
2.5 seconds OFF
Overcurrent protection /DUJHFXUUHQWÀRZVLQWRLQWHOOLJHQWSRZHUPRGXOH • Reconnect connector of compressor.
• Refer to “10-5.
A
How to check
inverter/compressor".
• Check stop valve.
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.
• Check refrigerant circuit and refriger-
ant amount.
• Refer to “10-5.
k
Check of LEV".
9
4-time blink
2.5 seconds OFF
Fin temperature/P.C.
board temperature
thermistor overheat
protection
7HPSHUDWXUHRI¿QWHPSHUDWXUHWKHUPLVWRURQWKHKHDWVLQNH[FHHGV
72 to 86°C or temperature of P.C. board temperature thermistor on the
inverter P.C.board exceeds 72 to 85°C.
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to “10-5.
I
Check of outdoor
fan motor".
10
5-time blink
2.5 seconds OFF
High pressure protec-
tion
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost thermistor
exceeds 70°C in COOL mode.
• Check refrigerant circuit and refriger-
ant amount.
• Check stop valve.
11
8-time blink
2.5 seconds OFF
Compressor synchro-
nous abnormality
The waveform of compressor current is distorted. • Reconnect connector of compressor.
• Refer to “10-5.
A
How to check
inverter/compressor".
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.
• Refer to “10-5.
I
Check of outdoor
fan motor.
• Refer to “10-5.
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. • Refer to “10-5.
L
How to check
inverter/compressor".
14
13-time blink
2.5 seconds OFF
DC voltage DC voltage of inverter cannot be detected normally. • Refer to “10-5.
A
How to check
inverter/compressor".
15
Outdoor
unit
operates.
1-time blink
2.5 seconds OFF
Frequency drop by cur-
rent protection
When the input current exceeds approximately 12A(KA18)/16A(KA24)
/16A(KA30)/16A(KA36), compressor frequency lowers.
• The unit is normal, but check the fol-
lowing.
&KHFNLILQGRRU¿OWHUVDUHFORJJHG
• Check if refrigerant is short.
• Check if indoor/outdoor unit air circu-
lation 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 de-
frosting in COOL mode
Indoor coil thermistor reads 46 °F [8 °C] or less in COOL mode, com-
pressor 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.
• Check refrigerant circuit and refriger-
ant amount.
• Refer to “10-5.
k
Check of LEV".
• Refer to “10-5.
G
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.
• Refer to “10-5.
k
Check of LEV".
• Check refrigerant circuit and refriger-
ant amount.
19
8-time blink
2.5 seconds OFF
PAM protection
PAM: Pulse Amplitude
Modulation
7KHRYHUFXUUHQWÀRZVLQWR,*%7,QVXODWHG*DWH%LRSRODUWUDQVLVWRU
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.
• Check if the connector of the com-
pressor is correctly connected.
• Refer to “10-5.
A
How to check
inverter/compressor".
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