How to Fix a Samsung Refrigerator That Is Not Cooling

A fridge that runs but stays warm usually has a frosted evaporator coil, a blocked vent, or dirty condenser coils. Work from easiest to hardest.

Medium risk — water and mains power are both in play.

Tools

Step 01
Confirm the settings
Set the fridge to 37F and the freezer to 0F. Turn off any demo or shop mode, which lights the panel but never runs the compressor.
Step 02
Clear the airflow
Pull food away from the rear vents inside both compartments. Blocked vents starve the fridge section even when the freezer is cold.
Step 03
Clean the condenser coils
Unplug the unit, pull it out, and brush and vacuum the coils behind the lower rear panel until the fins are clean and dust free.
Step 04
Check for a frosted evaporator
Remove the freezer rear panel. A solid sheet of ice over the coil means the defrost system failed and the fan cannot push cold air forward.
Step 05
Manually defrost and retest
Leave the fridge unplugged with doors open for eight hours, or melt the ice with a hair dryer on low. Restore power and check temperatures after 24 hours.

That points to the evaporator fan or a frost-blocked coil, not lost refrigerant. Air is not moving from the freezer into the fresh food section.