When your hydraulic slide-out rooms stop responding, the MIRC (Multiple Input Relay Controller) is often the culprit. The Lippert 134798 is the OEM-spec replacement Standard MIRC designed specifically for 2-room hydraulic slide-out systems, restoring full in/out operation without rewiring or custom fabrication.
The MIRC -- Multiple Input Relay Controller -- is the brain of Lippert hydraulic slide-out systems. It reads switch inputs from inside the coach, interprets the commanded direction, and routes power to the hydraulic pump and solenoid valves to move each room in or out. When this module fails, one or both rooms may refuse to move, move in only one direction, or throw fault codes on compatible display panels.
The Lippert 134798 Standard MIRC is purpose-built for 2-room configurations. It is a direct plug-in replacement for the original module on qualifying Lippert hydraulic slide systems, using the same connector pinout and mounting footprint so no wiring modifications are required on a compatible chassis.
Manages both slide-out rooms independently through a single controller, matching the original 2-room hydraulic system architecture.
Uses the OEM connector layout for compatible Lippert hydraulic slide systems -- no splicing, no adapter harnesses needed on qualifying rigs.
The Standard MIRC handles relay switching for hydraulic pump activation and solenoid direction control, the same logic architecture as the factory-installed unit.
Backed by Lippert's limited 1-year warranty, providing coverage against defects in materials and workmanship from the date of purchase.
The Multiple Input Relay Controller sits between your wall switches and the hydraulic power unit. It handles the relay logic that prevents simultaneous conflicting commands (such as trying to extend and retract at the same time) and protects the pump from overload conditions. Over time, relay contacts can wear or burn, moisture intrusion can corrode the PCB, and voltage spikes from chassis electrical events can damage the onboard circuitry.
Common symptoms of a failed MIRC include: rooms that will not extend or retract at all, rooms that only move in one direction, intermittent operation that clears after cycling 12V power, and no response from interior slide switches despite the pump relay clicking.
Replacing a MIRC is a straightforward task for an experienced RV DIYer comfortable working with 12V DC electrical systems. The general process involves: