When the reed switch in your RV's entry door or slide-out interlock circuit fails, the system loses the ability to detect whether the door is open or closed -- and that can prevent slide-outs from extending, trigger false alerts, or disable safety interlocks. The Lippert 379406 is the large-format OEM reed switch used across a wide range of Lippert-equipped Class A, Class B, Class C, fifth wheel, and travel trailer platforms. Replacing this small but critical component restores proper circuit operation and gets your coach back to normal in minutes.
A reed switch is a magnetically actuated electrical switch enclosed in a sealed glass or polymer capsule. In RV applications, Lippert uses reed switches to detect the open or closed state of entry doors and slide-out compartment doors. When a magnet mounted on the door moves close to the switch, the internal contacts close (or open, depending on configuration), sending a signal to the coach's control module.
The Lippert 379406 is the large version in Lippert's reed switch lineup -- physically larger than the standard small reed switch (sold separately) and designed for mounting locations that require a bigger footprint or where the switch must bridge a wider gap between door frame and door panel. If your coach originally used this switch and it has failed -- showing an open circuit where there should be a closed one, or vice versa -- this is the direct OEM replacement to order.
Magnetically actuated contacts sealed against moisture, dust, and road vibration -- no exposed mechanical parts to corrode or wear out.
Engineered to Lippert's original specifications so it drops into the existing bracket and wiring harness without modification.
At just 5.0 x 3.0 x 0.5 inches overall (including packaging), the switch itself mounts flush in tight door-frame channels common to Lippert slide and entry installations.
Used across Lippert-controlled slide-out systems and entry door interlock circuits on Class A motorhomes, fifth wheels, and travel trailers from multiple OEM builders.
Reed switches rarely fail from wear alone, but they are vulnerable to physical impact, excessive heat near the door frame, and corrosion at the wire leads if the weatherstripping around the mounting point lets moisture in. Common symptoms of a failed Lippert door reed switch include:
Lippert supplies slide-out mechanisms and entry door hardware to nearly every major RV manufacturer in North America, including Forest River, Coachmen, Jayco, Keystone, Heartland, Grand Design, Thor, Fleetwood, and Tiffin, among others. The 379406 reed switch is found in Lippert's electric slide-out room systems and in integrated entry door interlock circuits. It pairs with a small rare-earth magnet (typically mounted on the moving door panel opposite the fixed switch) that is separate from this listing.