Troubleshooting By Protection Code (Outdoor Unit) - Hitachi YUTAMPO Series Service Manual

6 Troubleshooting

Troubleshooting by protection code (Outdoor unit)

204

Alarm code

•  This alarm is displayed when an indoor unit stops answering to Master PC-ARFTE for more than 3 minutes.

•  Alarm recovery: When the communication is established again the alarm is recovered.

205

Alarm code

•  This alarm is displayed there is no messages from the central for more than 30 seconds.

•  Alarm recovery: When the communication is established again the alarm is recovered.

Protection 

P102

code

•  Outdoor unit LED301 blinks 2 times

•  This protection code is displayed 3 times before alarm 102 appears at the LCD controller.

Yes

LD301 blinks twice

Operation stopped due to the detection of 

abnormality by the compressor control. It may be an 

abnormality of the compressor and an abnormality 

Peak current cut

of the drive circuit in case of heavy load.

P103

Protection 

code

•  Outdoor unit LED301 blinks 3 times

•  This protection code is displayed 3 times before alarm 103 appears at the LCD controller.

Yes

LD301 blinks 3 times.

Abnormally slow rotation

74

SMGB0135 rev.0 - 06/2020

Indoor unit stops answering to Master PC-ARFTE

Operation stopped due to the detection of 

abnormality by the compressor control. It 

may be an abnormality of the drive circuit 

in case of heavy load.

Central Alarm, no Central message

LCD controller has no power

Abnormal

Check the compressor 

for loose connectors and 

continuity of the cord.

Normal

Is a leakage breaker

installed?

No

Is the insulation of the compressor 

normal? Check it with a megger.

Normal

Conduct a "self-check"

Abnormal low speed of the compressor

No

Is the service valve open?

Yes

Abnormal

Check the compressor 

for loose connectors and 

continuity of the cord.

Normal

Is a leakage breaker

installed?

No

Is the insulation of the compressor 

normal? Check it with a megger.

Normal

Conduct a "self-check"

Fix the point of 

abnormality.

Abnormal

Replace the compressor and 

inspect the outdoor electrical

parts.

Replace the parts found to be 

defective based on the results of 

the "self-check" evaluation.

Open the service valve

Fix the point of 

abnormality.

Abnormal

Replace the compressor and 

inspect the outdoor electrical

parts.

Replace the parts found to be 

defective based on the results of 

the "self-check" evaluation.