12-5) When Defrost Does Not Operate - Samsung RB215LASH Service Manual

Diagnostics

12-5) When Defrost does not operate

Pre-Check
1. With a shorted-out F or R Defrost Sensor,the fridge operates normally excepting Defrost
(The fault can be picked up with self-diagnosis,POWER ON/OFF).
2. There will be Heating trouble with a shorted-out Temp FUSE,which contributes to Defrost by natural
Temp increase resulting in a Temp Control problem stemmed from the increased COMP OFF time.
3. When a F or R Defrost Sensor is faulty as OPEN,Heating will not be terminated,and COMP will remain
off following the Temp FUSE short-off.(The fault can be picked up with self-diagnosis, POWER ON/OFF)
PANEL PCB KEY
Press Super Cool and Fridge
at the same time for 5 sec.
Press any button 3 times when
the entire display blinks.
-.Once:Forced Operation
-.Twice:R Defrost
-.3 times:F/R Defrost
-.4 times:Cancel
A
YES
R Defrost Heater #21
F Defrost Heater #15
R Defrost Heater IC70 #11
F Defrost Heater IC52 #17
COMMON RELAY K72
R Defrost Heater K71
F Defrost Heater K70
Start
Dose Defrost
start operating when F or R
Forced Defrost button
pushed?
YES
Is power supplied to
Defrost Heater?
NO
Are MICOM #21 &#15
"HIGH"(5V)?
YES
Are IC70 #11 &IC52
#17 "LOW"(0.7V)?
YES
Is Defrost
Heater Relay (K71,K70)
normal?
YES
Is contact of
Connector CN70 normal?
YES
Is Temp FUSE
on EVAP. normal?
YES
Is Defrost Heater
shorted out?
NO
Check wire assembled
status/Chang MAIN PCB ASS'Y
NO
NO
Defrost Sensor Temp higher
Maintain Forced Operation
NO
NO
NO
Check RELAY /Change PCB
NO
Check contact of Connector
NO
YES
63
Is concerned
than 12 ?
YES
for a certain time
Change PCB
Check IC70 &IC52 /
Change PCB
CN70 again
Change Temp FUSE
Change EVAP.ASS'Y