Service manual

33
11-4. TROUBLESHOOTING CHECK TABLE
LED1(Red) LED2(Yellow)
Lightning Twice Outdoor power system
• Check the connection of the compressor connecting wire.
• Refer to 11-6.E "How to check inverter/compressor".
• Check the stop valve.
Lightning 3 times
Discharge temperature
thermistor
• Refer to 11-6.F "Check of outdoor thirmistor".
• Refer to 11-6.F "Check of outdoor thirmistor".
Outdoor heat exchanger
temperature thermistor
Defrost thermistor
Lightning 7 times Nonvolatile memory data • Replace the outdoor electronic control P.C. board.
Lightning 8 times Current sensor • Replace the power board.
Lightning 11 times
Communication error between
P.C. boards
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
Lightning 12 times
Zero cross detecting circuit • Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
Abnormal point / Condition Correspondence
A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor after 5 minutes (in cooling) and
10 minutes (in heating) of compressor start-up.
A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor after 5 minutes of compressor start-up.
• Refer to 11-6.F "Check of outdoor thirmistor".
• Replace the outdoor electronic control P.C. board.
Indication
Overcurrent protection stop is continuously performed 3 times within 1
minute after the compressor gets started, or when converter protection
stop or bus-bar voltage protection stop is continuously performed 3 times
within 3 minutes after start-up.
A short circuit is detected in the thermistor during operation, or an open
circuit is detected in the thermistor after 10 minutes of compressor start-up.
Condition
The nonvolatile memory data cannot be read properly.
Lightning 6 times Serial signal
Fin temperature thermistor
P.C board temperature
thermistor
Lightning 4 times
Ambient temperature thermistor
Current sensor protection stop is continuously performed twice.
The communication protection stop between boards is continuously
performed twice.
The protection stop of the zero cross detecting circuit is continuously
performed 10 times.
A short or open circuit is detected in the thermistor during operation.
A short or open circuit is detected in the thermistor during operation.
5 timesLightning
Outdoor electronic control P.C. board(Parts side)
Lighting
IPM protection
Lock protection
3 times Goes out
Discharge temperature
protection
• Check the amount of gas and refrigerant circuit.
• Refer to 11-6.D "Check of LEV".
Fin temperature protection
P.C. board temperature
protection
High-pressure protection
8 times Goes out
Converter protection
• Replace the power board.
Bus-bar voltage protection (1)
• Replace the power board.
Bus-bar voltage protection (2)
13 times Goes out Outdoor fan motor • Refer to 11-6.G "Check of outdoor fan motor".
Lighting 8 times
Current sensor protection
• Replace the power board.
Lighting 11 times
Communication between P.C.
boards protection
• Check the connecting wire between outdoor electronic control
P.C. board and power board.
Lighting 12 times
Zero cross detecting circuit
protection
• Check the connecting wire among outdoor electronic control
P.C. board, noise filter P.C. board and power board.
•Check refrigerant circuit and refrigerant amount.
•Refer to 11-6.G "Check of outdoor fan motor".
• Check the amount of gas and the refrigerant circuit.
• Check stop valve.
• Reconnect compressor connector.
• Refer to 11-6.E "How to check inverter/compressor".
• Check the stop valve.
• Check the power module (PAM module).
Twice Goes out
4 times Goes out
5 times Goes out
9 times Goes out
Overcurrent is detected after 30 minutes of compressor start-up.
Overcurrent is detected within 30 minutes of compressor start-up
The bus-bar voltage exceeds 400V or falls to 200V or below during
compressor operating.
The bus-bar voltage exceeds 400V or falls to 50V or below during
compressor operating.
Discharge temperature exceeds 116:during operation and compressor
stops. Compressor can restart if discharge temperature thermistor reads
100: or less 3 minutes later.
The fin temperature exceeds 87: during operation.
The P.C. board temperature exceeds 70: during operation.
High-pressure is detected with the high-pressure switch (HPS) during
operation.
Failure occurs continuously 3 times within 30 seconds after the fan gets
started.
A short or open circuit is detected in the current sensor during compressor
operating.
Communication error occurs between the outdoor electronic control P.C.
board and power board for more than 10 seconds.
Zero cross signal cannot be detected while the compressor is operating.
The outdoor heat exchanger temperature exceeds 70: during cooling or
indoor gas pipe temperature exceeds 70: during heating.
A failure is detected in the operation of the converter during operation.
Outdoor unit
does not
operate.
LED2
LED1
• Refer to 11-6.B "How to check mis-wiring and serial signal
error".
The communication fails between the indoor and outdoor unit for 3 minutes.
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
Symptom
'Outdoor unit
stops and
restarts 3
minutes
later' is
repeated.
ON
OFF
2.5-second OFF
2.5-second OFF
The flashing frequency shows the number of times the LED blinks after every 2.5-second OFF.
(Example) When the flashing frequency is “2”.
0.5-second ON
0.5-second ON
NOTE 1. The location of LED is illustrated at the right figure. Refer to 11-7.1.
2. LED is lighted during normal operation.
OB389F--2qxp 07.9.3 5:08 PM Page 33