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B1. LED blinks once, then repeats (FCT0 Fault)
Protection Logic
Blink OFF Blink OFF
Y
N
Protection
logic
Check B
Blink 1 time
(FCT 0) Check B1
Out of spec?
(2.2 - 2.8V)
Reset Power
Replace Driver PCB
B2. LED blinks two times, then repeats (Stroke Trip)
Protection Logic
Blink Blink OFF Blink Blink OFF
Y
Y
Y
Y
Protection
logic
Check B
Blink 2 times
(Stroke Trip) Check B2
Compressor
Doesn’t work
Y
N
Compressor
Works Intermitte ntly
Capacitor
Spec.
Check C
Compressor
Damage
Check C
Replace
Capacitor
Replace
Compressor
N
N
Reset
Power
Stroke Trip
Occur?
Y
Repeat
Check Procedure
Harness
Connecting
Check C
Fix Harness
N
N
Cycle
Check E
Fix
Cycle
Replace
Driver PCB
OK
NG
B
GND
A
C
※ Devices should not be short-circuited when you check C
- Purpose : Detecting motor current and voltage error
- Check voltage at point A (Motor Voltage), point B (Motor Current) and Point C (Capacitor Voltage)
when compressor is off.
- Spec : Points A, B & C 2.5V ± 0.3V
- Purpose : Prevent abnormally long piston strokes.
- Case 1. If compressor doesn’t work and LED blinks
- Cause : Possibly harness from compressor to PCB might be defective
- Case 2. If compressor works intermittently and LED blinks
- Cause : Condenser Fan or Freezer Fan is not running. Sealed system problem such as moisture restriction,
restriction apillary tube or refrigerant leak.
- Logic : Compressor is forced to off and then tries to restart after 1 minute.
12-2 Check B
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