E831CB Series - 4K IP PoE Wired Bullet Camera - Troubleshooting Guide

Modified on November 06, 2025

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This guide provides detailed troubleshooting steps for the E831CB Series – 4K Deterrence IP PoE Wired Bullet Camera when paired with the N831 Series 4K Wired NVR. For setup and product specifications, refer to the E831CB Support Page.

TABLE OF CONTENTS

Reset Button & MicroSD Card Slot Location

The reset button and microSD card slot are located inside a sealed compartment on the underside of the camera, directly above the speaker area.

To access and use these components

  1. Locate the small metal RESET / microSD compartment cover on the bottom of the camera.
  2. Use a small screwdriver to remove the two screws on either side of the cover.
  3. Lift the cover to reveal both the reset pinhole button and the microSD card slot.

To reset the camera

  • Ensure the camera is powered on.
  • Insert a pin or paperclip into the reset pinhole.
  • Press and hold for 10 seconds until you hear an audio prompt confirming the reset.
  • The camera will reboot automatically and reconnect to your NVR within 1–2 minutes.
  • Replace the compartment cover and reattach both screws to maintain the IP67 weather seal.

To install or replace a microSD card

  • Insert a Class 10 or higher microSD card (up to 256 GB) with the label facing outward.
  • Push gently until it clicks into place.
  • The camera will automatically detect and prepare the card on the next reboot.
  • Replace the compartment cover and reattach both screws to maintain the IP67 weather seal.
Note: The reset process restores all camera settings, including passwords, network configuration, and motion zones, to factory defaults. The microSD slot allows for local backup recording when the camera is connected to a compatible NVR or network.

No Picture / Signal

  • Confirm your recorder supports 4K IP cameras. See Lorex.com/compatibility.
  • The E831CB may take up to 60 seconds to power on after connection. Wait two minutes before troubleshooting.
  • Ensure the camera is connected directly to the N831’s PoE port or through a PoE switch (IEEE 802.3af compliant).
  • If using a LAN connection, search your network for cameras in the NVR’s Device Search menu. See the N831 Troubleshooting Guide.
  • Check cables:
    • Use a known-good Ethernet cable to test.
    • Maximum recommended cable length: 300 ft (90 m).
  • If using 12V DC power instead of PoE, ensure the adapter is regulated 12V DC / 8.2W minimum.
  • Ensure your NVR output (HDMI or VGA) is properly connected and set to a supported resolution (4K or 1080p).

Picture is Too Bright

  • Avoid pointing the camera directly at light sources such as the sun, headlights, or spotlights.
  • Reposition the camera or angle it downward by approximately 15°.
  • Enable DWDR (Digital Wide Dynamic Range) in the NVR’s image settings.
  • Adjust brightness and contrast in the NVR’s image controls.

Picture is Too Dark

  • Adjust the camera’s brightness and exposure settings in the NVR menu.
  • Enable Color Night Vision (requires low ambient light).

Night Vision is Not Working

  • The IR LEDs automatically activate in low-light conditions.
  • If night vision does not activate:
    • Ensure the surrounding area is dark enough for IR mode to trigger.
    • Look for a faint red glow from the IR LEDs in total darkness.
    • Clean the lens and IR LED window with a soft, dry cloth.
    • Confirm that Smart IR or Night Vision settings are enabled on the NVR.
    • Listen for a soft clicking noise when switching between day and night modes—this indicates the IR cut filter is operating correctly.
  • IR range: Up to 82 ft (25 m) in total darkness.

Picture is Not Clear

  • Check the NVR Output Resolution. If your monitor supports 4K, set the output to 3840 × 2160 (4K). Otherwise, leave Automatic Recognition enabled or match your monitor’s native resolution.
    • To adjust: go to Main Menu > Configuration > System > General > Output Configuration, then set Output Resolution that's supported by your monitor.
  • Ensure the camera resolution is set to 4K (3840 × 2160 @ 15fps).
  • Use Cat5e or Cat6 cables rated for your distance and environment.
  • Clean the lens to remove dirt, fingerprints, or spiderwebs.
  • Remove the protective vinyl film from the lens.

Bright Spots or Glare in Night Video

  • Do not aim the camera through glass or reflective surfaces; IR light will reflect back into the lens.
  • Reposition the camera away from walls or white ceilings that reflect IR light.
  • Use exterior ambient lighting to improve clarity if the scene is too reflective.

No Audio

  • Ensure your NVR supports audio input/output (the N831 does).
  • Enable audio in the NVR:
    • Go to Main Menu > Record > Encode > Channel > Enable Audio.
    • Turn on audio output on your monitor or mobile device.
  • Ensure the microphone and speaker functions are enabled (the E831CB supports full-duplex two-way audio).
  • Audio recording is disabled by default; enable it manually if needed.
  • Note: Recording audio without consent may be prohibited in some regions.

Camera or NVR Not Powering On

  • Verify that the NVR power adapter (48V DC / 1.5A) is working.
  • Check PoE load:
    • Maximum output per port: 25.5W
    • Total PoE budget: 72W
  • Test by connecting a single camera directly to a PoE port with no extenders or splitters.

Network or Connection Problems

  • Ensure cameras are on the same network as the NVR when using an external PoE switch.
  • Check for IP conflicts:
    • Open the NVR menu > Camera > Device Search and ensure each camera has a unique IP address.
    • Reset the camera if you suspect duplicate IPs.
  • Verify your router allows the NVR’s outbound connection for remote viewing.

Video Lag or Poor Image Performance

  • Check your NVR’s total bandwidth. The N831 supports 56 Mbps total throughput.
  • Lower the camera’s bitrate (4096-6144 kbps recommended) or reduce the substream resolution.
  • Use AI Motion Detection recording mode instead of continuous recording to reduce bandwidth usage.

Remote Viewing or App Issues

  • Use the Lorex Connect App for iOS or Android.
  • Ensure a wired network connection between the NVR and your router.
  • Minimum recommended upload speed: 6 Mbps per 4K channel.
  • Reboot the NVR and router if cameras appear offline in the app.
  • If you forgot your NVR password, follow the steps in the N831 Password Recovery Guide.

Smart Person/Vehicle Detection Not Working

  • Ensure the feature is enabled:
    • Go to Main Menu > Configuration > Event > Detection Type > Person/Vehicle.
  • Draw motion zones and adjust sensitivity levels (1-8).
  • Angle the camera 15° downward for optimal detection accuracy.
  • Avoid detecting across moving tree lines, busy streets, or reflective surfaces.

Firmware and Maintenance

  • Update firmware on both the camera and NVR:
    • Go to Main Menu > Maintenance > Upgrade.
  • After updating, power cycle the system to reinitialize features.
  • Keep firmware up to date for improved AI accuracy and bug fixes.

Environmental and Mounting Notes

  • Operating temperature: −31°F to 140°F (−35°C to 60°C).
  • Weather rating: IP67 - weather resistant, not submersible.
  • Ensure mounting surface supports at least 3× camera weight (2.4 lb / 1.08 kg).
  • Seal RJ45 Ethernet connectors with silicone if exposed to rain.
  • Mount at approximately 10 ft (3 m) height, angled 15° downward for optimal coverage.

Cleaning and Maintenance

  • Clean the lens regularly using a soft microfiber cloth.
  • Do not use chemical-based cleaners.
  • Remove spiderwebs and debris from around the lens and IR LEDs.
  • For humid areas, use silica gel packs inside housing or junction boxes.

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