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TROUBLESHOOTING
1.2.5 Protection Control Code on 7-Segment Display
(1) Protection control code is displayed on 7-segment when a protection control is activated.
(2) Protection control code is displayed while function is working, and goes out when released.
(3) When several protection control are activated, code number with higher priority will be indicated (see
below for the priority order).
(a) Higher priority is given to protection control related to frequency control than the other.
<Priority Order>
* Low Pressure Ratio Protection
* High Pressure Ratio Protection
* High-Pressure Increase Protection
* Input Protection
* Current Protection
* Discharge Gas Temperature Increase Protection
* Frost Protection
(b) In relation to retry control, the latest retrial will be indicated unless a protection control related to
frequency control is indicated.
•
Retry indication continues for 30 minutes unless a protection control is indicated.
•
Retry indication disappears if the stop signal comes from all rooms.
NOTE:
The protection control code being indicated on 7-segment display is changed to an alarm code when
the abnormal operation occurs. Also, the same alarm code is indicated on the remote control switch.
Protection Control
Low Pressure Ratio Control
Code
Protection Control
Insufficient Voltage/Excessively
High Voltage Retry
Code
Inverter Trip Retry
High-Pressure Increase
Protection
Imbalanced Voltage
Protection
Current Protection
Discharge Gas Temperature
Increase Protection
Inverter Module Temperature
Increase Protection
Input Protection
Frost Protection
High Pressure Ratio Control
Remark
Cause of Stoppage for
Corresponding Unit
Automatic Stoppage of Transistor Module
(IPM Error)
(Over Current, Decrease Voltage,
Increase Temperature)
Instantaneous Over Current
Electronic Thermal Activation
Inverter Voltage Decrease
Increase Voltage
Abnormal Current Sensor
Instantaneous Power Failure Detection
Reset of Micro-Computer for Inverter
Code
Cause
Alarm Code
Indication
during Retry
Inverter Fin Thermistor Error, Protection
Earth Fault Detection for Compressor
(Only Starting)
Abnormal Power Source Phase
Increase Input
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