4-12) Unable To Defrost - Samsung RH25H561 Series Service Manual

TROUBLESHOOTING

4-12) Unable to Defrost

CN70
F-DEF-HEATER:Read resistance between CN102 #1 and CN70 #7
R-DEF-HEATER:Read resistance between CN102 #1 and CN70 #3
Defrost Sensor Voltage is lower than 3.1V
Refer to 4-1-1) Test mode on this manual.
F-DEF-SENSOR:Read resistance between CN30 #4 and #7
R-DEF-SENSOR:Read resistance between CN30 #6 and #7
Check all the sensors
Note
When F/R-DEF Sensor is
higher than +10℃ and +17℃, it will
stop heating and go back to Cooling
Operation.
F/R-DEF Sensor is
normal (with Self Diagnosis)
CN102
F/R-DEF Heater is
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
MAIN PBA connectors
are normal
Check Thermistor, Heater and
their contacts.
Repair or Replace defective
relays, or PBA Ass'y
Start
NO
YES
NO
normal
YES
NO
YES
NO
YES
heating
YES
Normal
NO
YES
55
Replace the sensor
Check Thermistor, Heater
and their connectors
Forced Operation for a certain time
Repair the connectors