Samsung Refrigerator Door Interlock Switch Parts — Models & Compatibility

Your Samsung fridge door won't close properly, or the interior lights stay on even when the door's shut. That's usually the door interlock switch failing — a small but critical part that tells your refrigerator when the door is actually closed. This hub covers the DA3400066C door interlock switch replacement that fits dozens of Samsung French door and side-by-side models from 2010 onward.

Is This the Right Part for Your Model?

Before ordering, you'll need your exact model number. On Samsung refrigerators, look for a label inside the left wall of the fresh food compartment, or sometimes on the upper left corner behind the door. The model number starts with RF, RS, or RH followed by numbers. Cross-reference it with our compatibility list below — this DA3400066C switch fits over 40 different Samsung models including the RF263, RF4287, RF28H, and RS25 series.

About This Replacement Part

The door interlock switch (also called a door closure switch) is a simple mechanical component mounted in the door frame that detects when the refrigerator door is fully closed. When the switch fails, your fridge doesn't know the door is shut — so lights stay on, cooling cycles may not run properly, and you might hear constant beeping alerts. It's a common failure point on Samsung French door models after 5-7 years of use, particularly on heavily-used refrigerators in family households. The DA3400066C replaces several Samsung part numbers including AP5306252 and PS4138763, and runs about $49 — a straightforward fix compared to service calls that can cost $200+ for the same repair.

Compatible Samsung Models

This interlock switch fits the following Samsung refrigerator models. If your model isn't listed but has a similar number pattern, check the parts diagram for your specific unit:

• RF Series (French Door): RF263BEAESR, RF4287HARS, RF23HSESBSR, RF28HMEDBSR, RF4267HARS, RF30HBEDBSR, RF323TEDBSR, RF28HDEDBSR, RF22K9581SR, RF28K9580SR
• RS Series (Side-by-Side): RS267TDRS, RSG307AARS, RS25H5000SR, RS265TDRS, RS25J500DSR

How to Tell If Your Interlock Switch Is Bad

The most obvious sign is interior lights that won't turn off when you close the door. Other symptoms include error codes related to door sensors, excessive frost buildup (because the fridge thinks the door's open), or the ice maker stopping production. You might also notice the touch screen stays active even when the door appears closed. Some Samsung models will display a "door open" warning on the panel constantly, even after you've checked that everything's sealed tight.

Installation Overview

Replacing the door interlock switch is a moderate DIY repair if you're comfortable working with basic tools. You'll need to remove the door seal around the affected area, locate the switch housing in the door frame, disconnect the wire harness, and swap in the new switch. The hardest part is usually getting the door seal back in place without creating gaps. Total time runs about 30-45 minutes for someone with basic appliance repair experience. Always unplug the refrigerator before starting any repair work.

Why Samsung Interlock Switches Fail

These switches fail primarily from mechanical wear — they're pressed thousands of times over the refrigerator's life. The plastic housing can crack, the internal spring can weaken, or the electrical contacts can corrode from humidity exposure. Samsung's French door models put extra stress on these switches because the doors are heavier and the switch location sometimes collects condensation. If you've got a high-traffic kitchen with kids constantly opening the fridge, expect this part to wear out faster than the manufacturer's estimates.

What Comes in the Box

The DA3400066C replacement includes just the interlock switch assembly — no mounting hardware or installation instructions. You'll reuse the existing screws from your old switch. The switch comes with the wire connector already attached, so it's plug-and-play once you've accessed the mounting location. Make sure to test the switch function before reassembling everything by manually pressing the switch plunger and verifying it clicks properly.

Alternative Part Numbers

If you're cross-referencing from a service manual or parts diagram, this DA3400066C switch replaces these Samsung and aftermarket part numbers: AP5306252, 2705488, PS4138763, and EAP4138763. They're all the same physical part with different supplier codes. Some online parts sites list it under "door switch" or "closure switch" instead of interlock switch, but it's the same component.