10 Troubleshooting
Troubleshooting procedure
SMGB0136 rev.0 - 07/2021
254
Alarm code
51
Abnormal operation of the current sensor.
• This alarm code is displayed when the current transformer is abnormal (0 A detection or 3 A alarm condition) and
the alarm has more than three occurrences in 30 minutes.
• Condition of activation:
- When the frequency of compressor is maintained at 6 to 10Hz (3HP) after compressor is started, one of the
absolute value of running current at each phase is ≤ 1.5A.
- Before the compressor is operated (at the end of control position) the current wave value is less than 3.0 A.
• This alarm forces all operations to stop (Outdoor & Indoor Units).
• The unit should be stopped to release the alarm.
Yes
No
Restart the operation
How is the compressor
operation when you restart
the compressor?
Compressor stops
immediately (nearly 18Hz)
Compressor does not operate.
P7 is displayed. (*2)
Faulty of OU PCB1. Replace
the electrical box. (*1)
Is the coil resistance of
the compressor normal?
Check the PCB1.
If OU PCB1 faulty, replace the
electrical box.(*1)
Replace the compressor.
? NOTE
• (*1): Make sure LED1 is OFF.
• (*2): P7 is shown at 7-segment on the outdoor unit PCB1.
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