The LiftMaster 78LM is a hardwired multi-function control panel utilizing a two-wire bell wire interface. Circuit analysis confirms a Security+ (v1) rolling code trigger mechanism. The integrated lighting control function operates via a specific voltage pulse to the logic board to toggle internal relays. Material specifications confirm a high-impact ABS plastic chassis with a mechanical micro-switch array rated for over 100,000 actuations.
Technical compatibility is restricted to Green, Red/Orange, or Purple learn button systems; this analog device does not handshake with Security+ 2.0 (Yellow Learn Button) openers. The hardware includes a lock-out feature that disables remote signal reception to prevent code grabbing. As an analog-signal device, it provides zero-latency response but lacks native Wi-Fi or smartphone status feedback.
- Interface: Hardwired two-wire terminal.
- Functions: Door trigger, Light toggle, and Remote lockout.
- Compatibility: Security+ (v1) only; Green, Red, Orange, Purple buttons.
To modernize this reliable analog hardware with smartphone alerts and remote scheduling, we recommend bridging the system with smart garage door controllers.
For users with newer Yellow Learn Button systems, the LiftMaster 78LM must be bypassed in favor of Security+ 2.0 compliant control panels.
