Samsung refrigerators—like all modern fridges—naturally experience condensation inside their compartments. Unfortunately, that moisture can freeze and turn into ice buildup, leading to airflow problems, warm temperatures, or frozen components.
To prevent this, Samsung refrigerators use a built-in defrost mode that melts frost before it becomes a serious issue. While this process usually happens automatically, Samsung also allows you to manually activate defrost mode when needed.
How to Force Defrost a Samsung Refrigerator:
- Press and hold Freezer and Lighting (or Energy Saver + Fridge) for 8 seconds until the display beeps.
- Press any button (usually the Fridge button) to cycle through modes until the display shows “Fd” (Full Defrost).
- The fridge will beep continuously while defrosting. The cycle takes 20–45 minutes and will stop automatically.
This guide explains what Samsung refrigerator defrost mode is, how it works, and how to activate it in 3 simple steps.
Samsung refrigerator defrost mode melts frost and ice buildup using internal heaters. The fridge defrosts automatically several times a day, but you can manually activate defrost mode by entering diagnostics, selecting RD (refrigerator defrost) or FD (full defrost), and allowing the cycle to run for about 20 minutes.
What Is the Samsung Refrigerator Defrost Mode?
Samsung refrigerator defrost mode is a standard feature designed to melt frost and ice buildup inside the refrigerator and freezer compartments.
During defrost mode:
- The refrigerator temporarily stops cooling
- A defrost heater turns on behind the interior panels
- Ice melts into water and drains through the defrost system
Condensation forms when warm air enters the refrigerator. Without defrosting, that moisture quickly freezes and interferes with proper cooling.
Read: How Freezer Defrost Works
Does A Samsung Refrigerator Defrost Automatically?
Yes. All Samsung refrigerators defrost automatically several times a day.
Each automatic defrost cycle:
- Runs for about 20 minutes
- Activates the defrost heater
- Clears light frost buildup without user input
Under normal conditions, you don’t need to do anything. However, manual defrost mode is helpful when ice buildup becomes excessive or when troubleshooting problems.
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Related: How To Reset Samsung Refrigerator Control Panel? 3 Easy Steps
How to Enter Defrost Mode on a Samsung Refrigerator
You can manually start defrost mode using the refrigerator’s diagnostics menu.
Step 1: Enter Diagnostics Mode
Press and hold the Freezer and Lighting buttons simultaneously for about 10 seconds.
- Timing varies by model
- A chime indicates diagnostics mode is active
Release the buttons once you hear the sound.
Step 2: Select the Defrost Mode Type
Scroll through the options until you see one of the following:
Refrigerator Defrost (RD)
- Defrosts only the fresh food compartment
- Best for ice buildup behind fridge panels or near fans
Full Defrost (FD)
- Defrosts both refrigerator and freezer
- Ideal for severe ice buildup or before moving the unit
Step 3: Allow the Defrost Cycle to Run
Once selected:
- The defrost cycle starts immediately
- The refrigerator may beep continuously
- Duration ranges from 20 minutes to over an hour, depending on ice buildup
The cycle ends automatically when all frost is melted.
Newer Model Button Combinations
Standard “Freezer + Lighting” doesn’t work on all models. Try these variations for newer models:
- For Models without a “Lighting” Button: Press and hold Energy Saver + Fridge for 8-10 seconds.
- For Family Hub (Touchscreen) Models: You must often enter the “Self Diagnosis” app on the screen or use the Fridge + Door Alarm buttons on the internal control panel.
- For 4-Door Flex Models: Press and hold Freezer + Fridge until the display flashes.
Decoding the Display Codes
- RD (Refrigerator Defrost): Only melts ice in the fresh food section. Use this for ice buildup behind the back panel.
- FD (Full Defrost): Melts ice in both the fridge and freezer. Use this if the freezer floor has a sheet of ice.
- OFF: Exit defrost mode immediately by repeating the button press.
When Should You Use Samsung Refrigerator Defrost Mode?
Manual defrost is not needed during normal operation, but it’s useful in specific situations.
1. Refrigerator Isn’t Defrosting Automatically
A faulty defrost heater or sensor may prevent automatic defrosting. Manual defrost can temporarily restore function while waiting for repairs.
2. Ice Buildup Around Circulation Fans
Ice can freeze the evaporator fan, causing noise or warm temperatures. Manual defrost safely melts ice without damaging plastic components.
3. Ice Maker Is Frozen Over
Warm air leaks can freeze the ice maker in place. Manual defrost can thaw it without removal.
4. Before Moving the Refrigerator
Using FD mode ensures all ice is melted before transport, preventing leaks and damage.
Safety Pro-Tip
- Don’t over-defrost: Running “FD” mode more than twice in a 24-hour period can stress the defrost heater and potentially blow the thermal fuse, leading to a permanent “No Defrost” condition.
How Long Does Samsung Refrigerator Defrost Take?
Most Samsung refrigerators complete a defrost cycle in about 20 minutes.
Severe ice buildup may extend the cycle beyond an hour.
Manual defrost modes will continue until all ice is fully melted, then stop automatically.
Defrost Drain Tube.
Note: Even if you force defrost, the ice will return in 48 hours if the drain tube is clogged or frozen. Check the “duckbill” valve at the back of the fridge to ensure the melted water actually leaves the unit.
Read: Samsung Refrigerator Error Code 21 V – Troubleshooting Guide
Frequently Asked Questions (FAQs)
Can you defrost a Samsung freezer without turning off the fridge?
Yes. Use RD mode to defrost only the refrigerator compartment, or FD mode to defrost all compartments.
Do Samsung refrigerators have a defrost cycle?
Yes. All Samsung refrigerators run automatic defrost cycles multiple times per day.
Why is my Samsung refrigerator not defrosting?
The most common cause is a failed defrost heater, defrost sensor, or control issue preventing heat activation.
How often should I manually defrost my Samsung refrigerator?
At least once per year, or more often if your refrigerator frequently develops ice buildup.
How do I know if my refrigerator is defrosting?
Cooling temporarily stops, and the rear interior panel may feel slightly warm while the defrost heater is active.
Related: All Known Samsung Refrigerator Problems
