Hitachi YUTAMPO Series Service Manual page 71

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