Samsung RH29H9000SR Service Manual page 65

TROUBLESHOOTING
4-2-2. Unable to Defrost
CN70
CN30
F-DEF-HEATER : Read resistance between MAIN PBA
CN70 #9 and SMPS PBA CN01 #3
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 CN30 #3
and #7
Check all the sensors
Note
When F-DEF Sensor is higher than
+10 ℃ and +17 ℃ , it will stop heating
and go back to Cooling Operation.
Start
F-DEF Sensor is
normal (with Self Diagnosis)
F-DEF Heater is normal
Defrost Sensor Temp is
lower than -5°C
Forced F Defrost
Power is supplied to
Defrost Heater
It goes back to
NO
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
65
NO
YES
NO
Check Thermistor, Heater and their
YES
NO
Forced Operation for a certain time
YES
NO
YES
YES
NO
Repair the connectors
• Sensor Check Point (CN30)
2PIN-1PIN : EXT-SENSOR
2PIN-3PIN : F-SENSOR
2PIN-4PIN : F-DEF-SENSOR
2PIN-5PIN : R-SENSOR
2PIN-6PIN : R-DEF-SENSOR
2PIN-9PIN : CV-SENSOR
2PIN-10PIN : CV-DEF-SENSOR
2PIN-11PIN : HUM1-SENSOR
2PIN-12PIN : HUM2-SENSOR
2PIN-13PIN : ICEROOM-SENSOR
2PIN-14PIN : PANTRY-SENSOR
Replace the sensor
connectors