Samsung Refrigerator 39C Error Code: Freezer Defrost Sensor Fix

Quick Answer

Samsung refrigerators fail at the defrost heater first - unlike LG refrigerators where the linear compressor is the well-known weakness, Samsung's Achilles heel is the defrost heating assembly. When the defrost heater fails, the evaporator coils ice over, airflow drops, and the freezer gradually warms up until 39C fires. The repair requires three steps: manually defrost the ice buildup with a hair dryer (critical - do not skip this or the new heater will not seat properly), replace the defrost heater assembly (DA47-00244Q for RF28 series, about $40), and replace the defrost sensor/fuse that triggered the code (DA32-10104N, about $15). Samsung French door service mode helps confirm the fault: hold Energy Saver and Fridge buttons for 8 seconds to enter service mode and view the defrost sensor reading. Samsung 39C is different from LG's defrost error in that Samsung requires replacing the entire heater assembly (heater plus thermal fuse together) rather than individual components.

SamsungRefrigeratorSeverity: highDifficulty: intermediate85% DIY Success

Time to Fix

60–120 min

Difficulty

intermediate

Parts Cost

$10 – $70

Tools Needed

Multimeter (ohm and continuity mode), Phillips screwdriver

What Does the 39C Code Mean?

The freezer defrost sensor has tripped or the defrost heater has failed, causing ice buildup on the evaporator coils and eventual freezer temperature rise.

Most Likely Causes

Based on aggregated repair data, here is the probability breakdown for this error code:

Defrost heater assembly failure - heater element burned out40%

Defrost thermal fuse blown due to prior overheating event24%

Defrost control circuit on main board failed (less common)22%

Defrost temperature sensor drift or failure14%

Symptoms You May Notice

39C displayed on Samsung refrigerator panel
Freezer warming up - food not frozen or partially thawed
Heavy frost or ice visible on the rear freezer wall
Refrigerator section warmer than normal
Ice maker stopped producing ice (ice buildup blocks ice maker)

Can you reset a Samsung refrigerator to clear the 39C code?

After replacing the defrost heater and sensor, cut power for 5 minutes. Reconnect the freezer panel and all components. Restore power. The 39C code should not return once the defrost cycle runs successfully (typically within 8-12 hours). Enter service mode to verify no stored codes remain.

Tools Required for Diagnosis

Multimeter (ohm and continuity mode)Phillips screwdriverNut driver (1/4")Hair dryer (manual defrost)TowelsFlashlight

Diagnostic Checklist

Follow these steps in order. We start with the easiest external fixes before opening up the machine.

Enter service mode

Enter service mode: hold Energy Saver and Fridge buttons for 8 seconds. Check the defrost sensor reading. A sensor reading of 'OF' or out-of-range confirms sensor or defrost heater circuit fault.

Unplug the refrigerator

With coils defrosted and power off

Test the defrost thermal fuse (located in-line on the heater

Replacement Parts

If your diagnostic testing proves the component has failed, you will need a replacement. We recommend OEM parts over aftermarket for water-handling components.

Part Name	OEM Number	Estimated Price
Samsung Defrost Heater AssemblyDA47-00244Q · $30–$70	DA47-00244Q	$30 – $70
Samsung Freezer Defrost SensorDA32-10104N · $10–$25	DA32-10104N	$10 – $25
Samsung Defrost Heater (Fridge Side)DA47-00140G · $20–$45	DA47-00140G	$20 – $45

Verify part fitment for your Samsung model

Repair vs. Replace Calculator

Appliance Age (Years)7 Yrs

Labor Approach

Our Verdict

REPAIR

Estimated Cost: $40 (Parts) vs $2850 (New Machine)

Frequently Asked Questions

Why is Samsung refrigerator 39C so common?

Defrost heater failure is Samsung's most common refrigerator fault, particularly on French door models made between 2014 and 2020. The defrost heater assembly runs every 8-12 hours throughout the life of the refrigerator - it is a high-cycle component. Once the heater element burns out, ice accumulates on the evaporator coils until airflow stops, the freezer warms, and 39C fires. This typically occurs at 5-8 years of use.

Can I just reset the Samsung 39C code without repairing the defrost heater?

You can manually defrost the freezer (which temporarily clears the ice and may reset the code), but the code will return within 1-4 days if the defrost heater is not replaced. Manual defrost is a diagnostic step, not a permanent fix. The defrost heater assembly replacement is required to prevent recurrence.

Do I need to replace the defrost sensor if I already replaced the heater?

Yes - replace both the heater assembly and the defrost sensor (DA32-10104N) together. The 39C code can be triggered by a failed sensor even when the heater is working, and vice versa. Since the parts together cost about $50-90 and the labor to access the evaporator is the same either way, replacing both components in one service visit prevents the need to open the freezer panel again for the other part a few months later.

Related Samsung Refrigerator Error Codes

Code: HUBSamsung Refrigerator Error Codes: 39C, 33E, 40E and More Code: 22CSamsung Refrigerator 22C: Freezer Sensor Fault Code: 25ESamsung Refrigerator 25E: Fridge Defrost Sensor Fault Code: 2ESamsung Refrigerator 2E: Freezer Sensor Shorted

Same Fix Works on These Brands

Samsung shares the same hardware platform with these brands. The diagnosis and repair steps are identical.

Samsung washerSamsung Washer 3C2 Error Code: Motor Stall Samsung washerSamsung Washer 3E Error Code: Motor Fault Samsung washerSamsung Washer 4C Error Code: No Water Supply Samsung washerSamsung Washer 4E Error Code: Water Supply Fault (Top Load)Samsung washerSamsung Washer 5C Error Code: Drain Error (Older Display)Samsung washerSamsung Washer 8C Error Code: Vibration Sensor Fault

Models Known to Experience 39C Errors

This repair applies to most Samsung refrigerators with this error code. Common model numbers include:

RF28R7351SR, RF28HMEDBSR, RF23M8070SR, RS22T5201SR, RF28K9070SR

Last verified for technical accuracy on March 14, 2026