6 Troubleshooting
Outdoor unit
SMGB0135 rev.0 - 06/2020
63
6
During stop: Self-diagnosis blinking mode
LD301
(red)
Blinking
times
Self-diagnosis contents
Main check point
How to repair
OFF
Normal stop
(Stopped by the indoor
thermostat or due to main
operation OFF)
1. No need to check
1. No malfunction
ONCE
Reset stop
1. Microprocessor was rebooted
1. Replace the outdoor unit controller.
2 times
Exceeded peak current
1. Failure of the outdoor unit controller
2. Abnormal compressor load
1. Replace the outdoor unit controller.
2. Check the compressor.
3 times
Abnormally low rotation speed
1. Failure of the outdoor unit controller
2. Abnormal compressor load
1. Replace the outdoor unit controller.
2. Check the compressor.
4 times
Switching failure
1. Compressor connector out of place
2. Abnormal compressor load
3. Failure of the outdoor unit controller
1. Insert the connector properly.
2. Check the compressor.
3. Replace the outdoor unit controller.
5 times
Exceeded overload limit
1. Obstruction of the surroundings of
the outdoor unit
2. Other causes
1. Remove the cause of obstruction.
2. Check the cycle piping.
6 times
Temperature increase of the OH
thermistor
1. Defective insertion of connector
2. Refrigerant leakage
3. Other causes
1. Insert the connector properly.
2. Check the cycle piping and recharge
refrigerant.
3. Replace the outdoor unit controller.
7 times
Thermistor abnormality
1. Defective insertion of connector
2. Disconnection or short-circuit of
thermistor wiring
3. Failure of the outdoor unit controller
1. Insert the connector properly.
2. Replace the thermistor.
3. Replace the outdoor unit controller.
9 times
Communication error
1. Wrong connection of the F cable
2. Disconnection of the F cable
3. Failure of the outdoor unit controller
4. Failure of the indoor unit controller
1. Connect the F cable properly.
2. Replace the F cable.
3. Replace the outdoor unit controller.
4. Replace the indoor unit controller.
10 times
Power source abnormality
1. Defective connection of the reactor
2. Abnormal AC input: Out of the range
(230 V ±10%)
3. Normal AC input
1. Connect the reactor properly.
2. Connect to a normal AC power source.
3. Replace the outdoor unit controller.
11 times
Stop of the outdoor unit fan due
to strong wind
1. Temporary stop of the outdoor fan
due to strong wind
1. Automatic restart when the wind slows
down.
12 times
Outdoor fan lock error
1. Temporary stop of the outdoor fan
due to strong wind
2. Propeller fan lock
3. Outdoor fan motor lock
4. Outdoor fan motor OK
1. Automatic restart when the wind slows
down.
2. Remove the foreign body.
3. Replace the fan motor.
4. Replace the outdoor unit controller.
13 times
EEPROM read error
Replace the outdoor unit controller
14 times
DC voltage abnormality
1. Abnormality of the outdoor unit
controller
2. Abnormal compressor load
1. Replace the outdoor unit controller.
2. Check the compressor.
15 times
Circuit abnormal
Replace the outdoor unit controller
16 times
High load stop
1. Service valve closed
2. Obstruction of the surroundings of
the outdoor unit
1. Check the service valve.
2. Remove the cause of obstruction.
