When your hydraulic slide-outs stop responding or behave erratically, the Multi-Input Relay Center (MIRC) is a common failure point. The Lippert 134799 is an OEM-spec standard MIRC designed as a direct replacement for 3-room hydraulic slide-out systems, restoring proper slide operation without rewiring or fabricating custom solutions.
The MIRC (Multi-Input Relay Center) is the electronic brain of Lippert's hydraulic slide-out systems. It receives input signals from wall switches and hand remotes, then coordinates the hydraulic pump and valve operations that extend and retract each slide room. Over time, relay contacts can burn, connectors corrode, or internal components fail -- especially in rigs that see heavy seasonal use or moisture exposure.
The Lippert 134799 Standard MIRC is built to OEM specification for systems managing 3 slide-out rooms. Swapping it in restores factory-level control logic, proper timing sequences, and slide room synchronization without modifying any existing wiring harnesses.
Matches Lippert factory specs for 3-room hydraulic slide-out systems -- plug-in fit, no custom wiring required.
Designed for standard (non-leveling) 3-room hydraulic slide setups common across many RV brands using Lippert chassis components.
At only 2 lbs., the 134799 is easy to handle during installation and does not add meaningful weight to the chassis.
Backed by Lippert's limited 1-year manufacturer warranty for peace of mind on a critical electrical component.
The Multi-Input Relay Center is mounted inside the RV, typically in a basement or chassis bay near the hydraulic pump. It contains relay banks, fuse protection, and logic circuitry that interpret switch commands and control which hydraulic valves open and in what sequence. Common failure symptoms include:
Before replacing the MIRC, it is worth checking fuses, verifying 12V power at the module, and confirming switch continuity. However, if the module itself has failed, replacement is a straightforward swap that most RV owners with basic electrical skills can complete.
Lippert hydraulic slide-out systems are found across a wide range of fifth wheels, travel trailers, and motorhomes produced by manufacturers including Forest River, Jayco, Coachmen, Heartland, and many others. The "standard" MIRC designation distinguishes this unit from leveling-integrated MIRC variants -- confirm your existing module's part number before ordering to ensure you are replacing like-for-like.