58
13-4. Troubleshooting check table
MXZ-2A
LED1(Red) LED2(Yellow)
Lightning
Twice
Outdoor power system
• Check the connection of the compressor connecting
wire.
• Refer to 13-6.
E
"How to check inverter/compressor".
• Check the stop valve.
Lightning
3 times
Discharge temperature
thermistor
• Refer to 13-6.
F
"Check of outdoor thirmistors".
• Refer to 13-6.
F
"Check of outdoor thirmistors".
Outdoor heat exchanger
temperature thermistor
Defrost thermistor
Lightning
7 times
Nonvolatile memory data
• Replace the outdoor electronic control P.C. board.
Abnormal point / Condition
Correspondence
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes (in
cooling) and 10 minutes (in heating) of compressor start-up.
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 5 minutes of
compressor start-up.
• Refer to 13-6.
F
"Check of outdoor thirmistors".
• Replace the outdoor electronic control P.C. board.
Indication
When over current protection stop is continuously performed three times
within 1 minute after the compressor gets started, or when converter
protection stop or bus-bar voltage protection stop is continuously performed
three times within 3 minutes after start-up.
When a short circuit is detected in the thermistor during operation, or
when an open circuit is detected in the thermistor after 10 minutes
of compressor start-up.
Condition
When the nonvolatile memory data cannot be read properly.
Fin temperature
thermistor
P.C board temperature
thermistor
Lightning
4 times
Ambient temperature
thermistor
When a short or open circuit is detected in the thermistor during
operation.
When a short or open circuit is detected in the thermistor during
operation.
5 times
Lightning
Outdoor electronic control P.C. board(Parts side)
Lighting
Over current
3 times
Goes out
Discharge temperature
protection
• Check the amount of gas and refrigerant circuit.
• Refer to 13-6.
D
"Check of LEV".
Fin temperature
protection
P.C. board temperature
protection
High-pressure
protection
• Replace the power board.
Bus-bar voltage
protection
13 times
Goes out
Outdoor fan motor
• Refer to 13-6.
G
"Check of outdoor fan motor".
8 times
Goes out
Current sensor
protection
• Replace the power board.
10 times
Goes out
Compreesor
• Reconnect compressor connector.
• Refer to 13-6.
E
"How to check inverter/compressor".
• Check the stop valve.
•Check refrigerant circuit and refrigerant amount.
•Refer to 13-6.
G
"Check of outdoor fan motor".
• Check around of gas and the refrigerant circuit.
• Check of stop valve.
• Reconnect compressor connector.
• Refer to 13-6.
E
"How to check inverter/compressor".
• Check the stop valve.
Twice
Goes out
4 times
Goes out
5 times
Goes out
9 times
Goes out
When 28A current flow into intelligent power module.
When the bus-bar voltage exceeds 430V or falls to 50V or below
during compressor operating.
When discharge temperature exceeds 116
:
during operation. Compressor
can restart if discharge temperature thermistor reads 100
:
or less 3
minutes later.
When the fin temperature exceeds 87
:
during operation.
When the P.C. board temperature exceeds 70
:
during operation.
When failure occurs continuously three times within 30 seconds after
the fan gets started.
When a short or open circuit is detected in the current sensor during
compressor operating.
The compressor doesn't synchronize
with the operating power.
When the outdoor heat exchanger temperature exceeds 70
:
during cooling or when indoor gas pipe temperature exceeds 70
:
during heating.
Outdoor unit
does not
operate.
Lightning
Once
LEV for drain
• Refer to 13-6.
D
"Check of LEV".
• Check the drain pump of the indoor unit.
When the indoor unit detects any abnormality in the LEV for drain.
LED2 LED1
No.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Symptom
'Outdoor unit
stops and
restarts 3
minutes
later' is
repeated.
Primary current protection
Secondary current protection
High-pressure protection
Defrosting in cooling
3 times
Lighting
Discharge temperature
protection
•
Check refrigerant circuit and refrigerant amount.
•
Refer to 13-6.
D
"Check of LEV".
•
Refer to 13-6.
F
"Check of outdoor thermistors".
4 times
Lighting
Low discharge
temperature protection
•
Refer to 13-6.
D
"Check of LEV".
•
Check refrigerant circuit and refrigerant amount.
These symptoms do not mean any abnormality of the
product, but check the following points.
•
Check if indoor filters are clogged.
•
Check if refrigerant is short.
•
Check if indoor/outdoor unit air circulation is short cycled.
Twice
Lighting
Once
Lighting
When the frequency of the compressor is kept 80Hz or more and
the discharge temperature is kept under 50
:
(COOL mode)
/40
:
(HEAT mode) for more than 40 minutes.
When the frequency of the compressor is kept 80Hz or more and
the discharge temperature is kept under 39
:
for more than 20
minutes.
When the input current exceeds 15A.
When the current of the compressor exceeds 15A.
When the indoor gas pipe temperature exceeds 45
:
during heating.
When the indoor gas pipe temperature falls 3
:
or below during cooling.
Outdoor unit
operates.
15
16
17
18
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 13-7.1.
2. LED is lighted during normal operation.
OB377--2.qxp 05.12.14 3:13 PM Page 58
