Samsung RS21 Service Manual page 54

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 10℃, 17℃
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 23℉?
Perform forced defrosting for F and
R 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.
54
NO
Exchange and troubleshoot the
YES
NO
YES
breaking of heater wire, contact of
NO
YES
NO
YES
YES
NO
Repair the connection terminal.
YES
corresponding sensor.
Check temp. fuse,
wire and so on.
Run forced operation for a
specified period.