If Defrost Does Not Operate (F,R Def Heater) - Samsung RF28R7201 AA Series Service Manual

4-2-5. If defrost does not operate (F,R DEF Heater)

R DEF ERROR
** Measuring point of resistance value according to heater**
F-DEF : CN70 "5"(BRN) ↔ CN71_1 "5" (BLK) measuring
resistance value(63 ohm ± 7%)
R-DEF : CN70 "3"(WHT) ↔ CN71_1 "5" (BLK) measuring
resistance value(120 ohm ± 7%)
** 0Ω : Short trouble / Ω∞: Open(bimetal, heater) trouble
Reference to the manual "Self-Diagnostic"
** Measuring point of resistance value according to sensor **
F-DEF : CN20 - "6" ↔ "8" measuring resistance value
R-DEF : CN20 - "5" ↔ "7" measuring resistance value
** 0Ω : Short trouble /Ω∞: Open trouble
Resistance value of sensor according to temperature
86℉(30℃) 4.22kΩ
68℉(20℃) 6.05kΩ
50℉(10℃) 8.87kΩ
32℉(0℃) 13.29kΩ
14℉-10℃) 20.42kΩ
-4℉-20℃) 32.23kΩ
-22℉(-30℃) 52.41kΩ
Recheck the applicable sensor.
Reference
If defrost sensor temperatures of fresh food
and freezer compartments are higher than
50℉(10℃), 53.6℉(12℃) by the heating from
heater, heating would be finished and will
return to cooling operation after a pause.
☞ Checking method of F,R DEF Heater resistance value
F-DEF : CN70 "5"(BRN) ↔ CN71_1 "5" (BLK)
R-DEF : CN70 "3"(WHT) ↔ CN71_1 "5" (BLK)
- Recheck if resistance values are different after the test
F DEF ERROR
temperature of defrost sensor
Manual defrosting of fresh food and
If you need the
temperature with
detail, refer to DATA1.
temperature table
No
return to cooling operation after
PIN Number
Start
Are the all deforst
heater normal?
Yes
Is defrost sensor by
self-diagnostic normal?
Yes
Is the
lower than 53.6℉
(12℃)?
Yes
freezer compartments
operate simultaneously.
Is power applied to
each defrost heaters?
Yes
Does
the system
heating for specified
time?
Yes
Normal
Is connection
terminal of MAIN PBA part
normal?
Yes
Check bimetal, heater itself,
disconnection etc.
Replace failure
Relay or replace PBA ASS'Y
85
TROUBLESHOOTING
No
Check the bimetal, heater disconnection,
wiring connection etc.
Refer to self-diagnostic
function in the manual
No
Replace the applicable sensor
No
manual operation for a certain time
If Fridge Key + FlexZone Key are pressed simultaneously for
6 seconds and then select FlexZone Key,
3rd test mode (manual defrosting) will be operated.
No
No
Repair connection terminal