Samsung RS257BABB Service Manual page 47

Diagnostics
11-3) If defrost function
� See Ref. 3: 'Check load' in the manual.
� Make decision on the basis of ref. 4 and
6 in the manual.
� See test function in the manual.
� Recheck the corresponding sensor for
an error if it fails in return.
Reference
If temp. of F, R defrosting sensor by the
working of heater are over 50℉
� See 'Load Drive Circuit section' and
Ref. 2: How to check failure of relay.
Start
Is F, R defrosting sensor by
self-diagnosis normal?
Is F, R Room defrosting heater normal?
Is temp. of the defrosting
sensor below 5?
Perform forced defrosting for F and
F Room at a time.
Is power applied to the
respective defrosting heaters?
Does the system
NO
return to cool i n g operati o n after heati n g
for a speci f i e d peri o d of ti m e?
Normal
Recheck the connection
terminal in Main PCB
Check temp. fuse, breaking of heater wire,
contact of wire and so on.
Exchange or troubleshoot the failure relay or
exchange PCB ass'y.
47
NO
Exchange and troubleshoot the
YES
NO
YES
NO
YES
NO
YES
YES
NO
Repair the connection terminal.
YES
corresponding sensor.
Check temp. fuse,
breaking of heater wire, contact of
wire and so on.
Run forced operation for a
specified period.