--- title: AC Loss description: AC Loss --- [Skip to content](https://support.geoarm.com/ac-loss#main-content) English Show submenu for translations ![geoarm-by-alarmclub-logo-2024-transparent.png\]](https://support.geoarm.com/hs-fs/hubfs/geoarm-by-alarmclub-logo-2024-transparent.png?height=50&name=geoarm-by-alarmclub-logo-2024-transparent.png) Open main navigation Close main navigation - English Show submenu for translations - Visit GeoArm.com Visit GeoArm.com Hello. How can we help? - There are no suggestions because the search field is empty. 1. [Support Center](https://support.geoarm.com/?hsLang=en) 2. [Honeywell](https://support.geoarm.com/honeywell?hsLang=en) 3. [Lyric LCP500](https://support.geoarm.com/honeywell?hsLang=en#lyric-lcp500) # AC Loss POSSIBLE CAUSE - Interrupted AC power supply.  Remedy Check transformer connection and powerline circuit breaker.    ![lcp500-l-resideo-honeywell-home-lyric-controller-wireless-touchscreen-control-panel-1](https://support.geoarm.com/hs-fs/hubfs/lcp500-l-resideo-honeywell-home-lyric-controller-wireless-touchscreen-control-panel-1.png?width=600&height=600&name=lcp500-l-resideo-honeywell-home-lyric-controller-wireless-touchscreen-control-panel-1.png) The Honeywell Lyric Controller has the ability to detect loss of power. An AC LOSS occurs when the primary input voltage drops below 9VDC. AC Loss will be displayed on the screen. After approximately 1 minute of Power Loss and no keypad activity, assuming the backup battery is good, the entire Touch Screen will go dark in order to conserve the battery regardless of programming. 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