Samsung RF31FM Series Manual page 187

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6. Self Diagnosis & Trouble Shooting
6-5. If defrost does not operate (F,R DEF Heater)
☞ Checking method of F,R DEF Heater resistance value
CN70-"3"(Brown) ↔ CN72 "3"(Gray)
CN70-"1"(White) ↔ CN72 "3"(Gray)
- Recheck if resistance values are different after the test
1) F DEF Heater
Is connection terminal of
MAIN PCB part normal?
Check bimetal, heater itself,
disconnection etc.
Replace failure Relay or
replace PCB ASS'Y
2) R DEF Heater
NO
YES
To do list
Repair connection terminal
187