Error code
5°C LED LAMP
Meaning
Defrosting heater stops too quickly before cycle completes
Moderate
What to do
Why this happens
Possible causes include lost or poor contact in the defrosting heater housing, a short circuit or breakage in the heater wire, compromised temperature fuse conditions, insufficient heater power supply voltage, or a malfunctioning defrosting relay.
How to fix it
Test heater element resistance and replace if open; check voltage during defrost cycle
SourceSamsung service manual