Samsung RT53 - When Defrost does not work (F DEF Heater)

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Hotpoint,Mba
4033 Cv
LG_MULTI_F_3828A20097W_1[1]
Samsung
Refrigerador
346481235-
WD856UHSAWQ-



0
TROUBLESHOOTING
4-2-3. When Defrost does not work (F
DEF Heater)
Defrost Sensor is
normal? (Check it
with Self-Diagnosis)
The Sensor
T
emperature
Value
is lower than 12
℃
.
After heating up for a while, it
goes back to Cooling Operation
MAIN PCB
Connection is normal?
Power is applied to
F-Defrost Heater.
Start
Do Forced Defrost
Normal
Replace the Sensor
Forced Operation for a while
No
No
No
No
No
Y
es
Y
es
Y
es
Y
es
☞ When checking with
the Self Diagnosis
F DEF. ERROR
Check Bimetal, Heater
Continuity or Wire Connection
All Defrost Heaters
are normal?
Y
es
No
Check the related sensors
if they are defective.
Temp vs. Resistance Table
30
℃
4.22
㏀
For more
detail data,
refer to
DATA1. Temp
Table
20
℃
6.05
㏀
10
℃
8.87
㏀
0
℃
13.29
㏀
-10
℃
20.42
㏀
-20
℃
32.23
㏀
-30
℃
52.41
㏀
S
E
G
V
o
l
t
a
g
e
W
a
t
t
O
H
M
RT29/
RT32
2
3
0
1
3
0
4
0
6
.
9
1
2
0
1
3
0
1
1
0
.
8
RT35/
2
3
0
1
6
0
3
3
0
6
** Sensor Resistance Reading Location **
F-DEF : Between CN30 #4 (RED)
↔
CN76-"1" (GRY)
** 0Ω : Short / ∞Ω : Open
** Sensor Voltage Reading Location **
F-DEF : Between PCB COMMON Ground
and CN30 #4 (or SEN_2)
** 0V : Short / 5V : Open
Note
When the temperature of the F DEF Sensor
goes over 12
℃
with the Defrost Heater heating up, it
stops heating and it goes back to Cooling Operation.
After pressing the Power Cool and
the Fridge buttons simultaneously for
6 seconds, push the Fridge button to
enter the Test Mode.
And then, when any one of t
he buttons
is pressed twice, the Forced Defrost will
start and "3
℃
, 5
℃
and 7
℃
" LEDs will
light up on the display panel.
** Heater Resistance Reading Location **
F-DEF : Resistance between CN70 #5 (BRN)
↔
CN77 #3 (ORG) should be ohm ± 10%.
** 0Ω : Short / ∞Ω : Open
(Bimetal / Thermal Fuse / Heater Defect)
- When there is a trouble in defrosting, select the Self-Diagnosis function before turning off the unit. And,
check if there is any defect in the Defrost Heater. If not, plug out the unit and do the Trouble-Shooting. (Refer
to the Self-Diagnosis function and check the details)