If Defrost Does Not Operate (F,R Def Heater); If Defrost Does Not Operate (F,R Def Heater) - Samsung RFG297AARS Service Manual

TROUBLESHOOTING

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

- If defrost has trouble, select the self-diagnostic function to detect the error of defrost heater before
Power Off. (Check the function with the self-diagnostic function)
R DEF ERROR
**Measuring point of resistance value according to heater**
F-DEF(Ice Duct parallel) : CN70#7(Brown) ↔ CN71#9
(Orange) measuring resistance value(55 ohm ± 7%)
R-DEF : CN70#5(White)↔C N71#9(Orange)
measuring resistance value(110 ohm ± 7%)
** 0Ω: Short trouble / ∞Ω: Open(bimetal, heater) trouble
**Measuring point of resistance value according to sensor **
F-DEF : CN30#4 ↔ CN76#1 measuring resistance value
R-DEF : CN30#8 ↔ CN76#1 measuring resistance value
** 0Ω: Short trouble / ∞Ω: Open trouble
Resistance value of sensor according to temperature
86℉(30℃) 4.22㏀
68℉(20℃) 6.05㏀
50℉(10℃)
8.87㏀
32℉(0℃) 13.29㏀
14℉(-10℃) 20.42㏀
-4℉(-20℃) 32.23㏀
-22℉(-30℃) 52.41㏀
**Measuring point of resistance value according to sensor **
F-DEF : CN30#4 ↔ CN76#1 measuring resistance value
R-DEF : CN30#8 ↔ CN76#1 measuring resistance value
** 0V: Short trouble / 5V: Open trouble
Reference
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#7(Brown) ↔ CN71#9(Orange)
R DEF ; CN70#5(White) ↔ CN71#9(Orange)
- Recheck if resistance values are different after the test
1) F DEF Heater
If you need the
temperature with detail,
refer to DATA1.
temperature
table
Manual defrosting of fresh food
Recheck the applicable
sensor.
If defrost sensor
2) R DEF Heater
F DEF ERROR
Start
Are the all deforst
heater normal?
Is defrost sensor by
self-diagnostic normal?
Is the temperature of
defrost sensor lower
than 53.6℉(12°C)?
If Energy Saver + Fridge/Power Cool Key are pressed
and freezer compartments
simultaneously for 8 seconds and then select any key,
operate simultaneously.
3rd test mode(manual defrosting) will be operated.
Is power applied to
each defrost heaters?
Does the system return
to cooling operation after
heating for specified time?
Normal
Is connection terminal of
MAIN PCB part normal?
Check bimetal, heater itself,
disconnection etc.
Replace failure Relay or
replace PCB ASS'Y
77
Check the bimetal, heater
disconnection, wiring connection etc.
Refer to self-diagnostic
function in the manual
Replace the
applicable sensor
manual operation for a certain time
Repair connection terminal