What to do if all LED off on Schaller Automation VN115/87plus EX Security Sensors?
- RRyan ColemanAug 20, 2025
If all LEDs are off on your Schaller Automation Security Sensors, begin by measuring the supply voltage. If that's not the issue, try activating the self-repair of the Polyfuse. If problems persist, replace the measuring head fuse. Also, check for any earth fault problems and as a last resort, exchange the measuring head.