4-11) Unable To Defrost - Samsung RS261MD Series Service Manual

4. TROUBLESHOOTING

4-11) Unable to Defrost

F-DeF-heATeR : Read resistance between cn71 #5 and #9
R-DeF-heATeR : Read resistance between cn71 #7 and #9
Defrost Sensor Voltage is lower than 3.1V
Press the Power Freeze and the Fridge buttons at
the same time for 8 sec and then go into the 2nd
Test mode.
F-DeF-SenSoR : Read resistance between cn40 #6 and #8
R-DeF-SenSoR : Read resistance between cn40 #8 and #11
check all the sensors
NOTE
When F/R-DEF Sensor is
higher than +10˚c and +17˚c, it
will stop heating and go back
to Cooling Operation.
Start
F/R-DeF Sensor is
normal (with Self Diagnosis)
F/R-DeF heater is
normal
Defrost Sensor Temp is
lower than -5°c
Forced F/R Defrost
Power is supplied to
Defrost heater
no it goes back to
cooling operation after
heating
normal
mAin PbA connectors
are normal
yeS
check Thermistor, heater and
their contacts.
Repair or Replace defective
relays, or PbA Ass'y
49
no
Replace the sensor
yeS
no
check Thermistor, heater
yeS
and their connectors
no
Forced operation for a certain time
yeS
no
yeS
yeS
no
Repair the connectors