When It (F Def Heater) Does Not Defrost - Samsung RL44Q Series Service Manual

TROUBLESHOOTING

4-2-3. When it (F DEF Heater) does not Defrost

- When there is a Defrost error, check if there is a Defrost Heater error with the Self-Diagnosis before turning
off the unit. And then, turn off the unit and do the trouble shooting. (Check with the Self-Diagnosis.)
Sensor Resistances by Temp
㏀
30ºC 4.22
㏀
20ºC 6.05
Refer to DATA1.
㏀
10ºC 8.87
Temp Table for
㏀
0ºC 13.29
detail Temp
㏀
20.42
-10ºC
㏀
32.23
-20ºC
㏀
52.41
-30ºC
F-SEN:Read Resistance between CN30 #1 and #6
R-SEN:Read Resistance between CN30 #3 and #6
D-SEN:Read Resistance between CN30 #2 and #6
AMBIENT-SEN :Read Resistance between CN31 #1 and #3
Defrost: Read Resistance between CN70 #7 and #5
Based on 220V Input Voltage (203ohm ± 7%)
Defrost Sensor Voltage is
lower than 2.25V
* * L L E E D D S S e e g g m m e e n n t t T T y y p p e e
Press the OPERATION & MENU buttons at
the same time for 6 sec and press the
MENU button once
Check all the sensors
< < N N o o t t e e > >
When Defrost Sensor is higher than +12 ℃,
(+10 ℃,+15 ℃, +17 ℃) after heating,it will
stop heating and go back to Cooling Operation.
☞ How to measure resistance for the Defrost
Heater.
- Measure the resistance between CN70 #7
(White) ↔ #5 (Violet)
- When the measurement is different, it needs
additional checking.
1) Defrost Heater
Start
Defrost Sensor
is normal (with Self Diagnosis)
FUSE in FUSE BLOCK is
normal?
Defrost Heater is
normal
Defrost Sensor Temp is
higher than 12°C
Do Forced Defrost
Power is applied to
Defrost Heater
It goes back to
NO
Cooling Operation
after heating
Normal
MAIN PCB connectors
are normal
Check Thermistor, Heater and
their contacts.
Repair or Replace defective
relays, or replace PCB Ass'y
73
NO
YES
NO
YES
NO
YES
YES
NO
NO
YES
YES
NO
YES
F DEF ERROR
Replace the sensor
Replace FUSE BLOCK and
Defrost Heater
Check Thermistor, Heater and
their contacts.
Forced Operation for a
certain time
Repair the connectors