18
TCH004
temperature thermistor, outdoor heat exchanger temperature
No.
Symptoms
Abnormal point/
Condition
Remedy
Condition
1
Outdoor unit
does not op-
erate.
1-time flash
every
2.5 seconds
Outdoor power sys-
tem
Overcurrent protection cut-out operates 3 consecutive times
within 1 minute after the compressor gets started.
Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
Check stop valve.
2
Outdoor thermistors Discharge temperature thermistor shorts, or opens during
compressor running.
defrost thermistor, P.C. board
thermistor or ambient temperature thermistor shorts, or opens
during compressor running.
Refer to 11-5.
F
"Check of outdoor
thermistors".
3
Outdoor control system Nonvolatile memory data cannot be read properly.
Replace inverter P.C. board.
4
6-time flash
2.5 seconds
OFF
Serial signal
The communication fails between the indoor and outdoor unit
for 3 minutes.
5
11-time flash
2.5 seconds OFF
Stop valve/
Closed valve
Closed valve is detected by compressor current.
Check stop valve.
6
7
'Outdoor unit
stops and
restarts 3
minutes later'
is repeated.
2-time flash
2.5 seconds OFF
Overcurrent protec-
tion
Large current flows into intelligent power module.
Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
Check stop valve.
8
3-time flash
2.5 seconds OFF
Discharge tempera-
ture overheat pro-
tection
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 refrig-
erant amount.
Refer to 11-5.
"Check of LEV".
9
4-time flash
2.5 seconds OFF
Fin temperature
/P.C. board tem-
perature thermistor
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.
Check around outdoor unit.
Check outdoor unit air passage.
Refer to 11-5. "Check of outdoor
fan motor".
10
5-time flash
2.5 seconds OFF
High pressure pro-
tection
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
thermistor exceeds 70°C in COOL mode.
Check refrigerant circuit and refrig-
erant amount.
Check stop valve.
11
8-time flash
2.5 seconds OFF
Compressor syn-
chronous abnormal-
ity
The waveform of compressor current is distorted.
Reconnect connector of compressor.
Refer to 11-5. "How to check in-
verter/compressor".
12
10-time flash
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 11-5. "Check of outdoor
fan motor.
Refer to 11-5. "Check of inverter
P.C. board.
13
12-time flash
2.5 seconds OFF
Each phase current
of compressor
Each phase current of compressor cannot be detected nor-
mally.
Refer to 11-5. "How to check in-
verter/compressor".
14
13-time flash
2.5 seconds OFF
DC voltage
DC voltage of inverter cannot be detected normally.
Refer to 11-5. "How to check in-
verter/compressor".
15
Outdoor unit
operates.
1-time flash
2.5 seconds OFF
Frequency drop by
current protection
When the input current exceeds approximately 7A(KA25)/
8A(KA35)/12A(KA50)14A(KA60)/16A(KA71), compressor
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
circulation is short cycled.
16
3-time flash
2.5 seconds OFF
Frequency drop by
high pressure pro-
tection
Temperature of indoor coil thermistor exceeds 55°C in HEAT
mode, compressor frequency lowers.
Frequency drop by
defrosting in COOL
mode
Indoor coil thermistor reads 8°C or less in COOL mode, com-
pressor frequency lowers.
17
4-time flash
2.5 seconds OFF
Frequency drop by
discharge tempera-
ture protection
Temperature of discharge temperature thermistor exceeds
111°C, compressor frequency lowers.
Check refrigerant circuit and refrig-
erant amount.
Refer to 11-5. "Check of LEV".
Refer to 11-5. "Check of outdoor
thermistors".
18
19
7-time flash
2.5 seconds OFF
Low discharge tem-
perature protection
Temperature of discharge temperature thermistor has been
50°C or less for 20 minutes.
Refer to 11-5. "Check of LEV".
Check refrigerant circuit and refrig-
erant amount.
8-time flash
2.5 seconds OFF
PAM protection
PAM: Pulse Ampli-
tude Modulation
The overcurrent flows into PFC (Power factor correction :
IC820) or the bus-bar voltage reaches 394 V or more, PAM
stops and restarts.
This is not malfunction. PAM pro-
tection will be activated in the fol-
lowing 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 The connector of compressor is disconnected, inverter check
mode starts.
Check if the connector of the com-
pressor is correctly connected.
Refer to 11-5. "How to check
inverter/compressor".
Notes: 1. The location of LED is illustrated at the right figure. Refer to “11-6-1. Inverter P.C. board”.
2. LED is lighted during normal operation.
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
LED
Flashing
ĺ
Inverter P.C. board
I
H
H
J
I
F
I
Check of indoor/outdoor connecting wire.
Replace indoor or outdoor P.C. board if
abnormality is displayed again.
(KA25/35/50)
(KA60/71)
Zero cross detecting
circuit
Zero cross signal for PAM control cannot be detected.
LED
indication
check
code
UP
U3
U4
FC
E8
E9
UE
Fin temperature thermistor,
/
frequency lowers.
16-time flash
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 11-5.
L
refrigerant circuit”.
"Check of outdoor
20
10-2. TROUBLESHOOTING CHECK TABLE
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