What to do if fault relay contacts are open and signaling LEDs blink frequently on ESP Safety Security Sensors?
- CCorey BurnsAug 5, 2025
If the fault relay contacts are open and the signaling LEDs on your ESP Safety Security Sensors are blinking frequently, it's likely due to optical interference, such as dust. To resolve this, wipe the protection windows with a soft cloth wetted with denatured isopropyl alcohol (IPA), then wipe with a clean, dry cloth to remove any residual dirt.