Kenmore 795.71312.311 Service Manual page 42

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11-2 Check B
B1. LED blinks once, then repeats (FCT0 Fault)
Blink OFF Blink OFF
- Purpose: Detecting motor current and voltage error
- Check voltage at point A (Motor Voltage), point B (Motor Current) andPoint C (Capacitor
Voltage) when compressor is off.
- Spec: Points A, B, & C 2.5V
Protection
Blink 1 time
logic
(FCT 0) Check B1
Check B
Out of spec?
(2.2 - 2.8V)
Reset Power
B2. LED blinks two times, then repeats (Stroke Trip)
Blink Blink OFF Blink Blink OFF
- 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 at capillary tube or refrigerant leak.
- Logic: Compressor is forced to off and then tries to restart after 1 minute.
Protection
logic
Check B
Replace
Driver PCB
OK
NG
Fix
Cycle
Check Procedure
0.3V
Y
Replace Driver PCB
N
Blink 2 times
(Stroke Trip) Check B2
Y
Compressor
Doesn't work
N
Y
Cycle
Check E
N
Repeat Stroke Trip
Occur?
N
Fix Harness
Y
Harness
Connecting
Check C
Y
Compressor
Works Intermittently
Reset
Power
Protection Logic
GND
Voltage
B
A
C
Protection Logic
Capacitor
N
Replace
Spec.
Capacitor
Check C
Y
Compressor
N
Replace
Damage
Compressor
Check C
Y