Samsung Refrigerator Error Code 55 E — What It Means & How to Fix It

What Does This Error Mean?

The 55 E error on a Samsung refrigerator points to a problem with the defrost temperature sensor in the freezer compartment. This sensor monitors temperature during the defrost cycle to make sure the evaporator coils reach a warm enough temperature to melt accumulated frost. When the sensor's reading is outside the normal range — or it stops responding altogether — 55 E is triggered. Your fridge may still be cooling for now, but without a working defrost cycle, ice will eventually build up on the coils and block airflow.

Affected Models

RF18HFENBSR
RF23M8570SR
RF22R7351SR
RF28R7351SR
RH22H9010SR
Samsung models with dual-evaporator systems

Common Causes

Failed defrost temperature sensor — resistance has drifted out of range due to age or heat exposure
Open or short circuit in the sensor wiring between the sensor and the main control board
Corroded or disconnected wire connector at the defrost sensor
Excessive ice buildup around the sensor preventing accurate temperature reading
Main control board defrost circuit failure — the board cannot read the sensor signal properly

How to Fix It

Start with a power reset. Unplug the refrigerator for 5 minutes, then plug it back in. Allow 15 to 20 minutes for the system to restart. Check if 55 E returns.

A temporary sensor glitch caused by a power surge or rapid temperature change may clear with a reset alone.
Manually defrost the freezer to rule out ice buildup. Empty the freezer, place towels on the floor, and leave the freezer door open for 24 to 48 hours. Alternatively, use a hair dryer on low heat to melt the ice carefully — never use sharp tools to chip ice.

Ice buildup around the defrost sensor is a common cause of inaccurate readings. If 55 E clears after a full manual defrost, the sensor itself may be fine — the defrost heater or timer could be the root cause.
Access the defrost temperature sensor. On most Samsung models it is located behind a panel inside the freezer compartment, clipped to the evaporator coils. Remove the freezer interior back panel to access it.

You will typically need to remove shelves, the ice maker (if present), and several screws to reach the evaporator panel.
Test the sensor with a multimeter. Disconnect the sensor connector and measure resistance across the sensor terminals. A healthy defrost sensor typically reads 5,000 to 20,000 ohms at room temperature. An open circuit (infinite resistance) or a short (near zero ohms) means the sensor has failed.

Search for your specific Samsung model's sensor resistance specification to confirm the exact expected value.
Replace the defrost temperature sensor if it failed the resistance test. Install the new sensor on the evaporator coil in the same position, reconnect the wiring, and reassemble the freezer panel. Power on and monitor for 24 hours.

After reassembly, allow at least 24 hours before checking temperature — the fridge needs time to return to normal operating temperature.

When to Call a Professional

Defrost sensor replacement is a manageable DIY repair for most people. Sensors typically cost $15 to $50. If replacing the sensor does not clear 55 E, the main control board may be at fault, which costs $150 to $400 and is worth having professionally diagnosed.

Frequently Asked Questions

Will my food spoil with 55 E showing?

Not immediately. The 55 E code is a sensor fault, not necessarily a cooling failure. Your fridge may still be maintaining temperature. However, if the defrost cycle is not working correctly, ice will build up on the evaporator over days or weeks and eventually block airflow — causing temperature problems. Monitor your fridge temperature and act on the repair promptly.

How do I know if 55 E is the sensor or the control board?

Test the sensor with a multimeter first. If the sensor tests in the normal resistance range, the problem is more likely in the wiring or the control board. If the sensor is out of spec, replace it — it is cheap and usually solves the problem. Only suspect the board if a new, correctly tested sensor does not clear the code.

Is 55 E covered under Samsung warranty?

Samsung refrigerators typically carry a 1-year parts and labor warranty. If your fridge is under warranty, call Samsung support at 1-800-726-7864 before attempting any repairs — DIY repair may void the warranty coverage.