How to Defrost a Samsung Refrigerator (and Fix Why It Won't)
Written by Dmitriy Sukhov · Founder, Express Xpert Appliance RepairUpdated July 2026
Samsung refrigerators enter forced defrost when you hold two buttons for about 8 seconds, until the panel beeps and reads Fd or rd. The cycle melts evaporator ice in 20 to 40 minutes. Forced defrost is a reset, not a repair. Frost that returns within a few days means the defrost heater, thermostat, or sensor has failed. Call (888) 822-7754 if it comes back.
Your Samsung fridge is icing over, warming up, or showing frost on the back panel. That means the automatic defrost cycle is not keeping up. Samsung builds in a forced-defrost mode you can run yourself, and it is safe to use. This guide shows you how to run it, and what it means when the ice comes straight back.
What Your Samsung Panel Is Telling You
Read the display first. What the panel shows narrows a frost problem down to one of five situations, and two of them you can clear yourself in under an hour.
| What you see | What it means | What to do |
|---|---|---|
| Fd or rd on the display | Forced defrost is running right now. | Keep both doors shut and leave it alone for 20 to 40 minutes until the cycle ends on its own. |
| Heavy frost on the rear freezer panel, no code | The automatic defrost cycle is not clearing the coil. | Run forced defrost. If the frost is back within a few days, the defrost heater or thermostat has failed. |
| 5E, 22E, or 21E on the display | The control board has logged a defrost or fan sensor fault. | Write the code down and book a technician. These are board-level faults with no safe home fix. |
| A sheet of ice under the drawers or on the freezer floor | The defrost drain tube is frozen or clogged. | Unplug the fridge, pull the drawers, and clear the ice over the drain. Repeat clogs need Samsung's drain-clip fix. |
| Frost keeps building even with a good door seal | The defrost system itself has failed. | Stop running resets. Have a technician test the heater, thermostat, and defrost sensor behind the rear panel. |
Most Common Causes
Forced defrost not run (frost buildup)
Samsung fridges self-defrost on a timer, but ice can outpace it. Most models enter forced defrost by holding two button combos (often Energy Saver + Lighting, or Fridge + Power Freeze) for about 8 seconds until the panel beeps and shows 'Fd' or 'rd'. The cycle melts evaporator ice in 20-40 minutes. This is the DIY-safe reset to try first.
Defrost heater burned out
A heating element behind the rear interior panel melts evaporator frost on each cycle. If it fails, ice packs solid, blocks airflow, and the fridge warms while the freezer stays cold. Symptoms: heavy back-wall frost that returns days after manual defrosting. Testing requires panel removal and a multimeter for continuity. Technician only, plus the part is heated and electrical.
Defrost thermostat or bimetal failure
This safety sensor closes to allow the heater to run only when the coil is cold, then opens when warm. If it sticks open, the heater never powers on and ice accumulates. If stuck closed, the heater overworks. There's no reliable at-home test without disassembly and continuity checks at freezing temps. Diagnosis and replacement are technician only.
Faulty defrost sensor or control board
Samsung models use a defrost sensor (and sometimes a fuse) reporting coil temperature to the main PCB. A bad sensor or board can skip defrost cycles entirely, often paired with error codes like 5E, 22E, or 21E on the display. Reading and clearing codes is DIY-safe, but board-level diagnosis and soldered components are technician only.
Drain tube frozen (Samsung 'icicle' issue)
After defrost, meltwater should run to a drain pan. On many Samsung models the drain tube clogs or freezes, sending water back to refreeze as a sheet of ice under the drawers or on the freezer floor. A DIY-safe check: unplug, remove drawers, and look for ice over the drain. Persistent reclogging needs a pro to install Samsung's drain-clip fix.
Door seal or overuse keeping coils iced
Warm, humid South Florida air sneaking past a worn door gasket dumps moisture onto the coils faster than any defrost cycle can clear it. Check the seal by closing the door on a dollar bill, it should tug when pulled. Wipe gasket grooves clean. If frost keeps building with a good seal, the defrost system itself is the real culprit.
When to Call a Pro
Forced defrost is a safe reset, but if frost returns within days, the heater, thermostat, sensor, or control board has failed, and those involve the electrical evaporator assembly behind the rear panel. Stop there and call Express Xpert. We serve Miami-Dade, Broward, and Palm Beach 24/7 with flat-rate pricing, no diagnosis fee when the repair proceeds, certified and insured techs, and a 90-day parts-and-labor warranty.
Express Xpert serves Miami-Dade, Broward & Palm Beach 24/7 with flat-rate pricing and a 90-day warranty. Book a certified technician →
Frequently Asked Questions
How do I put my Samsung refrigerator in forced defrost mode?
With the doors closed, press and hold a two-button combination, commonly Energy Saver + Lighting or Fridge + Power Freeze, for about 8 seconds until you hear a beep and the panel shows 'Fd' or 'rd'. The forced-defrost cycle runs roughly 20-40 minutes. Combos vary by model, so confirm against your owner's manual first.
Why does my Samsung fridge keep frosting up after I defrost it?
A manual or forced defrost only melts the current ice, it doesn't fix why ice forms. If frost returns within a few days, the defrost heater, thermostat, sensor, or control board has likely failed, or the drain is frozen. These are evaporator and electrical repairs best handled by a technician.
Is it safe to defrost a Samsung refrigerator myself?
Running forced-defrost mode or unplugging the fridge to let ice melt is safe DIY. Avoid chipping ice with sharp tools, which can puncture coils, and never open the sealed refrigerant system or work on the heater wiring. If the defrost system itself is faulty, call a certified, insured technician.
Read next
- refrigerator not cooling — If the fridge is warm in both compartments and not just frosted, work the causes in the order a technician rules them out.
- freezer not freezing — Frost and a freezer that will not hold 0F often share a cause, and this guide separates airflow faults from sealed-system faults.
- Samsung appliance repair in Miami — What our EPA-608 certified technicians carry for Samsung refrigerators, and the flat-rate pricing before anyone opens a panel.
- refrigerator repair across Miami-Dade and Broward — Same-day refrigerator service, 24/7, with a 90-day parts-and-labor warranty and no diagnosis fee when the repair proceeds.
Safety and reference sources
- FoodSafety.gov: food safety during a power outage — Federal guidance on how long refrigerated food stays safe once the compartment warms up.
- EPA Section 608 technician certification — The federal certification a technician must hold before opening a sealed refrigerant system.
- ENERGY STAR refrigerators — Federal program data on refrigerator energy use, useful when weighing a repair against replacement.