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Error code reference
Samsung Refrigerator Error Code Fridge Off LED
Fridge defrost sensor (R-DEF-Sensor) error - faulty opening or short circuit.
SourceSamsung RT18/RT21 Refrigerator - Full Service Manualp. 41-42
Diagnostic procedure
The full Fridge Off LED procedure
Step 1 is visible so you can confirm you are on the right page. The remaining steps, the ones that tell you whether to actually replace a part, unlock with any pass.
MyPros+ · DiagnosticsStep 1 preview
1
First diagnostic step
Check voltage between MAIN PCB CN31 #3 and #4 should be within 4.5V~0.5V.
SourceSamsung RT18/RT21 Refrigerator - Full Service Manualp. 41-42
More steps, wiring diagram references, and verified part numbers
Includes expected resistance and voltage values, connector pinouts, and supersession notes for replacement parts.
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Where this code is documented
1 manual in the MyPros+ library documents this code for Samsung refrigerator.
Models covered by the manuals that document this code
75,000+ service documents · 20,000+ error codes · 100+ brands
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