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12-3. TROUBLESHOOTING CHECK TABLE
No.
Symptom
LED indication
Outdoor unit
1-time blink every
does not op-
2.5 seconds
erate.
1
2
3
6-time blink
4
2.5 seconds OFF
11-time blink
5
2.5 seconds OFF
14-time blink
2.5 seconds OFF
6
16-time blink
2.5 seconds OFF
7
17-time blink
2.5 seconds OFF
8
'Outdoor unit
2-time blink
stops and
2.5 seconds OFF
9
restarts 3
minutes later'
is repeated.
3-time blink
2.5 seconds OFF
10
4-time blink
2.5 seconds OFF
11
5-time blink
2.5 seconds OFF
12
8-time blink
2.5 seconds OFF
13
10-time blink
2.5 seconds OFF
14
12-time blink
15
2.5 seconds OFF
13-time blink
16
2.5 seconds OFF
Outdoor unit
1-time blink
operates.
2.5 seconds OFF
17
3-time blink
2.5 seconds OFF
18
4-time blink
2.5 seconds OFF
19
5-time blink
2.5 seconds OFF
20
OBH865
Abnormal point/ Con-
dition
Outdoor power sys-
Overcurrent protection cut-out operates 3 consecutive times
tem
within 1 minute after the compressor gets started.
Outdoor thermistors Discharge temperature thermistor, fin temperature thermistor,
defrost thermistor, P.C. board temperature thermistor, outdoor
heat exchanger temperature thermistor or ambient tempera-
ture thermistor shorts or opens during compressor running.
Outdoor control sys-
Nonvolatile memory data cannot be read properly.
tem
(Upper lamp of OPERATION INDICATOR lamp of the indoor
unit lights up or blinks 7-time.)
Serial signal
The communication fails between the indoor and outdoor unit
for 3 minutes.
Stop valve/
Closed valve is detected by compressor current.
Closed valve
Outdoor unit
Outdoor unit is defective.
(Other abnormality)
4-way valve/
The 4-way valve does not work properly.
Pipe temperature
The indoor coil thermistor detects an abnormal temperature.
Outdoor refrigerant
A closed valve and air trapped in the refrigerant circuit are
system abnormality
detected based on the temperature sensed by the indoor and
outdoor thermistors and the current of the compressor.
Overcurrent protec-
Large current flows into power module (IC700).
tion
Discharge tem-
Temperature of discharge temperature thermistor exceeds
perature overheat
116°C, compressor stops. Compressor can restart if discharge
temperature thermistor reads 100°C or less 3 minutes later.
protection
Fin temperature /
Temperature of fin temperature thermistor on the heat sink
P.C. board tem-
exceeds 75 ~ 86°C or temperature of P.C. board temperature
perature thermistor
thermistor on the inverter P.C. board exceeds 72 ~ 85°C.
overheat protection
High pressure pro-
Indoor coil thermistor exceeds 70°C in HEAT mode. Defrost
tection
thermistor exceeds 70°C in COOL mode.
Compressor syn-
The waveform of compressor current is distorted.
chronous abnormal-
ity
Outdoor fan motor
Outdoor fan has stopped 3 times in a row within 30 seconds
after outdoor fan startup.
Each phase current
Each phase current of compressor cannot be detected nor-
of compressor
mally.
Bus-bar voltage
Bus-bar voltage of inverter cannot be detected normally.
(DC)
Frequency drop by
When the input current exceeds approximately 10A, compres-
current protection
sor frequency lowers.
Frequency drop by
Temperature of indoor coil thermistor exceeds 55°C in HEAT
high pressure pro-
mode, compressor frequency lowers.
tection
Frequency drop by
Indoor coil thermistor reads 8°C or less in COOL mode, com-
defrosting in COOL
pressor frequency lowers.
mode
Frequency drop by
Temperature of discharge temperature thermistor exceeds
discharge tempera-
111°C, compressor frequency lowers.
ture protection
Outside temperature
When the outside temperature thermistor shorts or opens,
thermistor protec-
protective operation without that thermistor is performed.
tion
Condition
34
Remedy
• Reconnect connector of compres-
sor.
• Refer to 12-5.
"How to check
inverter/compressor".
• Check stop valve.
• Refer to 12-5.
"Check of outdoor
thermistors".
• Replace inverter P.C. board.
• Refer to 12-5.
"How to check
miswiring and serial signal error.
• Check stop valve.
• Refer to 12-2.2. "Flow chart of the
detailed outdoor unit failure mode
recall function".
• Refer to 12-5.
"Check of R.V.
coil".
• Replace the inverter P.C. board.
• Check for a gas leak in a
connecting piping etc.
• Check the stop valve.
• Refer to 12-5.
"Check of outdoor
refrigerant circuit".
• Reconnect connector of compressor.
• Refer to 12-5.
"How to check
inverter/compressor".
• Check stop valve.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 12-5.
"Check of LEV".
• Check around outdoor unit.
• Check outdoor unit air passage.
• Refer to 12-5.
"Check of outdoor
fan motor".
• Check refrigerant circuit and refrig-
erant amount.
• Check stop valve.
• Reconnect connector of compressor.
• Refer to 12-5.
"How to check
inverter/compressor".
• Refer to 12-5.
"Check of outdoor
fan motor.
• Refer to 12-5.
"Check of inverter
P.C. board.
• Refer to 12-5.
"How to check
inverter/compressor".
• Refer to 12-5.
"How to check in-
verter/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.
• Check refrigerant circuit and refrig-
erant amount.
• Refer to 12-5.
"Check of LEV".
• Refer to 12-5.
"Check of outdoor
thermistors".
• Refer to 12-5.
Check of outdoor
thermistors.
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