Samsung RT38 Service Manual page 58

TROUBLESHOOTING
LED blinking frequency depending on protecting functions(Inverter PBA)
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.
Description
Normal
Operation
Starting
Failure
IPM Fault
Position
Sensing Error
Motor Locked /
Over RPM
Under Voltage
Over Voltage
LED blinking frequency depending on protecting functions If the same blinking, After 5 minutes, Follow the
Remarks
LED Blinking Frequency
N/A
1. Check the COMP terminals short(U,V,W)
2. Check IPM Pins short of Inverter PBA
3. Check IPM operating Voltage(under DC 13.5V)
4. Other cases, check the COMP, cycle, etc.
1. Check COMP wire connections(U,V,W)
2. Check PCB Bottom side soldering state
3. Other cases, check the COMP, cycle, etc.
1. Check PCB Bottom side soldering state.
2. Check Input voltage oscillation
3. Other cases, check the COMP, cycle, etc.
1. Check input voltage under
AC 53V(Input Power AC110~127V) or
AC 101V(Input Power AC 220 ~ 240V)
2. Check PCB Bottom side soldering state.
1. Check input voltage over
AC 155V(Input Power AC110~127V) or
AC 310V(Input Power AC 220 ~ 240V)
2. Check PCB Bottom side soldering state.
63
Remark