Samsung Refrigerator Not Cooling — Twin Cooling, Error Codes & Diagnostic Mode

Common Symptoms

• Fresh food section above 40°F while freezer holds 0°F normally (Twin Cooling asymmetric failure)
• Both sections warming — compressor or sealed system fault
• Display showing 88 88, 8E, 14E, 39E, PC ER, or 25E error codes
• Ice Room Fan in door ice maker not audible when door is open (Family Hub / RF28 models)
• Heavy frost block visible on evaporator coil behind fresh food back panel
• Refrigerator section humidity abnormally high — frost forming on food or walls

Most Likely Causes

1. 1

   Defrost System Failure — 25E Code (Fresh Food Defrost Sensor Open)

   Samsung code 25E indicates the fresh food defrost sensor has failed open circuit or is reading out of range. The defrost sensor (part of the DA32-00006W thermistor family) monitors the evap coil temperature during defrost and terminates the heater cycle at the correct temperature. A failed sensor causes the control board to either run the defrost heater too long (overheating the coil compartment) or not at all. The result over 3–7 days is a thick ice block on the fresh food evap coil and complete loss of airflow to the fridge section. Confirm by entering Diagnostics Mode and reading the sensor temperature — if it shows an unrealistic value or the code 25E is active, test DA32-00006W thermistor resistance.

2. 2

   Fresh Food Evaporator Fan Failure — 8E Code

   Samsung error code 8E (also shown as 8C or 8 E) indicates a fault in the fresh food evaporator fan motor circuit. The fan motor (DA31-00146E, DA31-00146F, or DA31-00334A depending on model) draws cold air across the fresh food evap coil and circulates it through the refrigerator compartment. When the motor fails or its tachometer feedback signal is lost, the control board logs 8E and cold air stops circulating in the fridge section while the freezer remains normal. Test: hold the fresh food door switch closed and listen for the fan behind the back wall. No sound with door switch depressed = failed motor.

3. 3

   Ice Room Fan Motor Failure — 39E Code (Family Hub and RF28 Models)

   Samsung Family Hub and RF28R7351SR models include an Ice Room compartment in the freezer door that houses a dedicated fan motor — the Ice Room Fan. This fan circulates cold air through the door ice maker compartment to maintain ice-making temperatures. Error code 39E indicates the Ice Room Fan has failed or lost tachometer feedback. A failed Ice Room Fan causes ice clumping, ice maker shutdown, and in severe cases can affect overall door temperature management. The Ice Room Fan motor is accessed by removing the ice maker compartment cover inside the freezer door — typically 2–4 screws.

4. 4

   DA32-00006W Thermistor Failure — 14E Code (Fresh Food Sensor)

   Samsung error code 14E indicates the ice maker sensor or fresh food compartment thermistor has failed. The DA32-00006W is Samsung's standard NTC thermistor used across multiple fresh food and freezer circuits. At 32°F (0°C) it reads approximately 16,000–17,000Ω; at room temperature (68°F/20°C) it reads approximately 10,000Ω; at freezer temperature (-4°F/-20°C) it reads approximately 32,000–36,000Ω. An OL reading or a reading outside this range confirms sensor failure. A failed thermistor causes the main control board to misread compartment temperature — it may close the damper or cut fan speed when the compartment is actually warm, causing progressive temperature rise.

5. 5

   Main Control Board Failure — DA92-01156A (PC ER Code)

   Samsung error code PC ER indicates a communication fault between the main control board (DA92-01156A on RF28R7351SR and related French door models) and a sub-component PCB. This is the board that controls the compressor relay, both evaporator fan motors, the Ice Room Fan, defrost scheduling, and the damper actuator. When the relay section or a communication driver on the board fails, the error code PC ER appears. Visually inspect the board for burn marks, swollen capacitors, or corrosion near the relay cluster. If Diagnostics Mode shows active output commands that produce no component response, the board output circuit has failed.

6. 6

   88 88 Code — Power Interruption Reset or Refrigerant Pressure Event

   Samsung code 88 88 (or 88 88 alternating on the display) is a power interruption or commissioning code that appears after a power outage, brownout, or when the unit first powers up. In most cases it clears on its own within 1–2 minutes and is not indicative of a component failure. If 88 88 persists beyond 5 minutes, it can indicate a main board communication fault or a refrigerant system pressure event — the pressure sensor detected an out-of-range reading at startup. Enter Diagnostics Mode to check for concurrent active error codes that explain why 88 88 is not clearing.

Quick DIY Checks

1. 1Enter Samsung Diagnostics Mode and read stored error codes before touching anything: press and hold both the Fridge temperature button and the Freezer temperature button simultaneously for 8 seconds. On most RF28R7351SR, RF23M8070SR, and RS28A500ASR models the display will cycle through stored fault codes. On RH22H9010SR models the entry may require holding Power Freeze + Power Cool for 8 seconds — check your tech sheet (behind the kick grille). Key codes to look for: 88 88 (power reset or pressure event), 8E (fresh food fan), 14E (ice maker / fresh food sensor), 25E (defrost sensor open), 39E (Ice Room Fan), PC ER (control board communication). Write down all displayed codes before the display resets. This single step narrows the fault to a specific circuit and eliminates most guesswork.
2. 2Test the DA32-00006W thermistor resistance if 14E or 25E is displayed: unplug the refrigerator. Locate the thermistor — on RF28R7351SR it is clipped to the fresh food evap coil outlet duct behind the fresh food back panel. Disconnect the connector and set your multimeter to resistance mode (20kΩ range). At room temperature (68°F/20°C): reading should be approximately 10,000Ω (10kΩ). At freezer temperature: approximately 32,000–36,000Ω. OL = open circuit (failed, replace). Near 0Ω = shorted (failed, replace). Any reading outside ±20% of the expected value at the measured ambient temperature is a failed sensor. DA32-00006W is a common part across Samsung RF and RS models — confirm with your model number.
3. 3Test the fresh food evaporator fan (8E code): open the fresh food door and locate the door switch — a small plastic button in the door frame that tells the board the door is open. Hold this button down firmly with your finger to simulate a closed door. The fresh food evap fan should run within 5 seconds — listen for a light hum behind the back panel. No sound = failed motor. Also manually rotate the fan blade (after unplugging) — it should spin freely with no resistance or grinding. Remove the fresh food back panel (4–6 screws) to access the fan motor. Disconnect the motor connector and measure winding resistance: Samsung DA31 series fresh food fan motors typically read 100–200Ω. OL = burned out winding, replace the motor.

1. 4Check the Ice Room Fan motor (39E code — RF28R7351SR and Family Hub models): the Ice Room is the insulated ice maker compartment inside the freezer door. Open the freezer door and locate the Ice Room cover panel (typically 2–3 Torx T20 screws). Remove the panel to expose the ice maker tray and the Ice Room Fan motor. With the refrigerator running, hold the freezer door switch closed — the Ice Room Fan should spin. No movement = failed motor. The Ice Room Fan motor on RF28R7351SR is a small DC brushless motor with a push-on connector. Disconnect the connector and measure resistance between the red/black motor wires — should read 50–150Ω. OL = failed, replace the Ice Room Fan motor.
2. 5Run Samsung forced defrost to clear frost-blocked evap coil: if Diagnostics Mode showed 25E or if the fresh food section is warm with the fan running normally, the fresh food evap coil may be ice-blocked. Enter forced defrost: hold Power Freeze and Fridge buttons for 8 seconds (same as Diagnostics entry on some models — the sequence enters defrost mode directly on RF28/RF23 series). A click confirms the defrost heater is energized. Allow the defrost cycle to complete — 20–30 minutes. After defrost, check if the fridge cools within 2 hours. If it cools normally but the frost returns within 5–7 days, the defrost heater (DA47-00244A) or defrost thermostat has failed — test resistance: heater should read 15–30Ω; OL = burned out.
3. 6Inspect and test the DA92-01156A main control board (PC ER code): unplug the unit. The main control board is located in the upper rear of the refrigerator compartment behind a plastic cover on RF28R7351SR and RF23M8070SR, or in the rear lower machine compartment on RS28A500ASR and RH22H9010SR — consult the tech sheet for exact location. Remove the board cover and visually inspect for burn marks, discoloration, or swollen electrolytic capacitors. Burn marks around the relay cluster or near the IGBT section indicate a failed output circuit. If the board looks clean but PC ER persists, check the wiring harness connectors for corrosion or backed-out pins. A failed board that passes visual inspection can be confirmed by testing each commanded output in Diagnostics Mode — if the board commands an output (fan, defrost, compressor) but the component does not respond and you verify voltage at the connector is absent, the board relay or driver has failed.

Repair vs Replace

Recommended Tools & Parts

• Samsung DA32-00006W Thermistor

  NTC temperature sensor for Samsung fresh food compartment and ice maker circuits. Reads approximately 10,000Ω at 68°F (20°C) and 16,000–17,000Ω at 32°F (0°C). OL or near-zero resistance confirms failure. Fixes 14E and 25E error codes. Compatible with RF28R7351SR, RF23M8070SR, RS28A500ASR, and multiple other Samsung models — verify with your model number.

  $15–$30

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• Samsung Fresh Food Evaporator Fan Motor DA31-00146E

  Replacement fresh food evaporator fan motor for Samsung French door and side-by-side refrigerators. Resolves 8E error code and warm-fridge symptom. DC brushless motor with tachometer feedback. Match the DA31 suffix to your specific model (DA31-00146E, DA31-00146F, DA31-00334A).

  $30–$80

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• Samsung DA92-01156A Main Control Board

  OEM replacement main control board for Samsung RF28R7351SR, RF23M8070SR, and related French door models. Controls compressor relay, evap fans, defrost heater circuit, Ice Room Fan, and damper. Resolves PC ER communication faults and relay section failures. Inspect for burn marks before ordering.

  $80–$250

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• Samsung Defrost Heater DA47-00244A

  Replacement defrost heater assembly for Samsung fresh food evaporator. Mounts on or around the evap coil. Test resistance — should read 15–30Ω; OL confirms failure. Resolves frost-blocked evap coil when defrost system is confirmed as failed. Includes heater and mounting clips.

  $20–$50

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• Digital Multimeter (Klein MM400 or AstroAI AM33D)

  Required for testing thermistor resistance (10–36kΩ range), fan motor winding resistance (100–200Ω), defrost heater resistance (15–30Ω), and supply voltage. Get a meter with a dedicated resistance mode and continuity buzzer. The Klein MM400 is a reliable choice for appliance repair at any skill level.

  $20–$55

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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