Samsung RF23HT Series Service Manual page 106

TROUBLESHOOTING
4-2-18. LED blinking frequency depending on protecting functions
If Failure Condition is detected during compressor is operating, immediately stop
Compressor operating and stand by 5 minutes. During this 5 minutes, RPM command
signal is not available. It means, even if available RPM command signal is applied to
the compressor, it does not work and keep standing by.
Blinking time is 1 second and dwell time is 2 seconds.
LED Blinking Frequency
LED blinking frequency depending on protecting functions
If the same blinking, After 5 minutes, Follow the Remarks
Protecting
Functions
Normal
Operation
Starting
1. Short between COMP U,V and W Phase (CN102)
Failure
2. Short among IPM Pins (No. #1 ~ 26)
3. Drop the IPM operating Voltage under DC 13.5V
IPM Fault
4. Other cases, check the COMP, cycle, etc.
1. Open the COMP wire (CN102)
Abnormal
2. Bad condition of R1(ex. Bad soldering)
Current
Detection
3. Other cases, check the COMP, cycle, etc.
1. Operating the locked rotor COMP within 5 second.
2. Operating the COMP under 1,000 RPM more than
Motor
5 second.
Locked /
3. Occur the huge change of input voltage in a
Over RPM
moment.
4. Other cases, check the COMP, cycle, etc.
1. Drop the input voltage under AC 53V
Under
Voltage 2. Short resistor R525 (DC link Resistor)
1. Increase the input voltage over AC 155V
Over
2. Short resistor among R522, R523 and R524 (DC
Voltage
Link Resistor)
1. Check Terminal CN103
Communication
2. Short or Open resistor R210, R212
Error
3. Short or Open harness between Main and Inverter
106
Remarks
N/A