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COMMON RELAY RY71
Defrost Heater RY72
RELAY CHECK
REFERANCE
Diagnostics
8-5) When Defrost does not operate
1. With a shorted-out 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 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)
Maintain Forced Operation for a
certain time
Dose Defrost work upon
Forced Defrost KEY pushed?
Is concerned Defrost Sensor
Temp higher than 12 °C?
Start
NO
NO
YES
YES
Is power supplied to
Defrost Heater?
YES
NO
Check soldering, Change PCB
Is MICOM #30
"HIGH"(5V)?
NO
YES
Check IC3 / Change PCB
Is output #16 of IC3
low?
NO
YES
Check RELAY / Change PCB
Is Defrost Heater
Relay (RY76) normal?
NO
YES
Check contact of Connector CN71
again
Is contact of Connector
N71(browwn) normal?
NO
YES
Change Bimetal
Is Bimetal in EVAP.
normal?
NO
YES
Change EVAP. ASS'Y
Is Defrost Heater
shorted out?
YES
NO
Check wire assembly
Pre-Check
A