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Error code reference
Samsung Refrigerator Error Code Colder/Coldest LED
EXT-Sensor defect (Ambient temperature sensor failure).
SourceSamsung RL55VQ Bottom Mount Freezer - Service Manualp. 41
Diagnostic procedure
The full Colder/Coldest 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 CN30-1(Yellow) and 3(Yellow); should be within 4.5V~0.5V.
SourceSamsung RL55VQ Bottom Mount Freezer - Service Manualp. 41
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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