Question 1

the video quality at night is super grainy and dark on my dual lens floodlight, even with the lights on.

Accepted Answer

DIAGNOSIS The infrared (IR) night vision is activating alongside the white floodlights, causing sensor conflict and poor image quality. FIX Force the camera to use color night vision only. 1) In the Eufy Security app, go to Device Settings > Night Vision. 2) Change ‘Vision Mode’ from ‘Auto’ to ‘Color Night Vision’. 3) Ensure the floodlight schedule is set to ‘Auto’ or ‘On’ during night hours. The white lights will provide enough illumination for the sensor without needing the grainy IR. IF THAT DIDN'T WORK The lenses are likely dirty (see cleaning fix above), or the floodlights aren’t pointing correctly. Manually adjust the light heads to illuminate the specific area you want to monitor. The camera needs light on the subject, not just ambient glow. HEADS UP In ‘Color Night Vision’ mode, the image will be black and white if the floodlights are off. You must have the lights scheduled to turn on via motion or on a timer for this to work. It’s a trade-off: color video requires active light.

Question 2

i get ‘Failed to Connect to Device’ when trying to view live feed on my eufy floodlight cam.

Accepted Answer

DIAGNOSIS The camera’s local connection to your home network is fine, but the remote P2P connection used for live view outside your home network has failed. FIX Restart your home router. This refreshes all network connections and is the fix 80% of the time. 1) Unplug your router and modem for 30 seconds. 2) Plug the modem back in, wait for it to fully boot. 3) Plug the router back in and wait. 4) Once your Wi-Fi is back, check the app. The camera should reconnect automatically within 2 minutes. IF THAT DIDN'T WORK The issue is likely port blocking on your router. Ensure UPnP (Universal Plug and Play) is enabled in your router’s settings. If you can’t enable UPnP, you may need to manually forward ports for Eufy (varies by model, check Eufy’s support site for specifics). HEADS UP If you’re trying to view on cellular data, some mobile carriers (like certain MVNOs) block P2P ports. Test the live view on a different Wi-Fi network (like a friend’s house) to confirm. If it works there, the issue is your mobile carrier.

Question 3

the floodlights on my e340 won’t turn on automatically at night anymore, even though the camera works.

Accepted Answer

DIAGNOSIS The auto-light settings got disabled or corrupted, or the ambient light sensor is dirty/blocked. FIX Re-enable and reconfigure the light schedule in the app. 1) Go to Device Settings > Light Settings. 2) Set ‘Light Schedule’ to ‘Auto’. 3) Tap ‘Auto Light Settings’ and ensure ‘Turn On Light Upon Motion’ is ON. 4) Set the ‘Start Time’ to Sunset and ‘End Time’ to Sunrise. Save. IF THAT DIDN'T WORK The ambient light sensor is the small, dark circular window near the cameras. It might be covered by dirt, a spider web, or even paint if you recently painted the house. Clean it carefully with a dry cotton swab. HEADS UP The ‘Auto’ schedule relies on your phone’s location services to determine sunset/sunrise. If you denied the Eufy app location permissions, it won’t work. Go to your phone’s settings and ensure Eufy Security has location access set to ‘Always’ or ‘While Using’.

Question 4

my eufy floodlight cam goes offline every few days and i have to reboot it by flipping the breaker.

Accepted Answer

DIAGNOSIS This is a chronic Wi-Fi connectivity drop, usually due to a weak signal or IP address conflicts with your router. FIX Assign a static IP address to the camera in your router settings. This is the most effective permanent fix. Steps: 1) Find the camera’s MAC address in the Eufy Security app under Device Settings > General > About. 2) Log into your router’s admin page. 3) Find DHCP settings, reserve an IP for that MAC address. Reboot the router and camera. IF THAT DIDN'T WORK The signal is likely too weak. The E340 has a weaker antenna than some models. Install a Wi-Fi extender or mesh node closer to the installation point—preferably one that supports both 2.4GHz and 5GHz bands. HEADS UP If you have a dual-band router, ensure the camera is connected to the 2.4GHz network, not the 5GHz. The 5GHz band has shorter range and worse wall penetration, which can cause these drops.

Question 5

how do you clean the lenses on the eufy floodlight cam? it’s all blurry now.

Accepted Answer

DIAGNOSIS Dust, pollen, or water spots have built up on the outer glass dome covering both camera lenses, blurring the image. FIX Use a simple, non-abrasive cleaning method. 1) Power off the unit at the circuit breaker for safety. 2) Use a soft microfiber cloth slightly dampened with distilled water. 3) Gently wipe the large, curved glass dome in a circular motion. 4) Dry immediately with a dry part of the cloth. Do not use chemicals or window cleaner. IF THAT DIDN'T WORK If blur is still present in the app view, check if it's condensation inside the lens housing—a sign of seal failure. You’ll see droplets behind the glass. That requires a warranty replacement. HEADS UP The glass has a permanent anti-glare coating. Scrubbing it or using any cleaner (like Windex) will permanently damage the coating, making night vision flare and images hazy forever.

Question 6

why does my eufy floodlight make a constant buzzing or humming sound? it’s driving me nuts.

Accepted Answer

DIAGNOSIS That's the internal cooling fan running continuously, which is not normal for this model. It indicates the unit is overheating. FIX This is a hardware flaw requiring a replacement. The fix is to get a new unit from Eufy. Steps: 1) Note the serial number in the app. 2) Record an audio clip of the buzz. 3) Contact Eufy support via the app with the evidence; they’ll process a warranty swap. IF THAT DIDN'T WORK In rare cases, a firmware bug can cause the fan to stay on. Try a hard reset: hold the sync button on the unit for 10 seconds until you hear a prompt, then reconfigure in the app. If the buzz persists, it’s definitely hardware. HEADS UP Don’t ignore this. A constantly running fan points to a failing thermal management system, which can shorten the lifespan of the internal components dramatically.

Question 7

the motion detection on my eufy floodlight cam is terrible, keeps missing people right in front of it.

Accepted Answer

DIAGNOSIS The Activity Zone or Motion Sensitivity settings in the Eufy Security app are either too restrictive or the sensor is physically obstructed. FIX Open the app and immediately reconfigure the detection zone. 1) Device Settings > Detection Settings > Activity Zone. 2) Draw a zone covering the entire area where you need detection. 3) Set Motion Sensitivity to at least 5. 4) Ensure 'Human Only' detection is ON if you want to reduce other triggers. IF THAT DIDN'T WORK The dual-lens design means one lens is wide-angle, one is telephoto. Check that the primary detection lens (the main, larger one) isn’t blocked by a spider web, dirt, or a bug. Wipe it gently with a microfiber cloth. HEADS UP The camera prioritizes detecting motion crossing the zone, not motion toward the camera. Angle the floodlight so the detection path is perpendicular to the typical walking path for best results.

Question 8

my eufy floodlight cam won’t turn on at all, just dead. i wired it right, power’s good.

Accepted Answer

DIAGNOSIS The internal fuse on the camera's mainboard likely blew, often due to a power surge or incorrect wiring voltage. FIX You must replace the floodlight unit. Eufy doesn’t sell user-replaceable fuses for this model. Steps: 1) Turn off circuit breaker. 2) Disconnect the unit. 3) Contact Eufy support with your proof of purchase; they’ll usually send a replacement under warranty if it’s a power surge failure. IF THAT DIDN'T WORK Double-check you have constant power (not a switched circuit) and that your wiring matches the unit's voltage requirement (120V in North America). A non-contact voltage tester can confirm power is reaching the wires. HEADS UP If you connected it to a three-way switch circuit or a dimmer, that can instantly damage the unit. It requires a standard, always-on single-pole switch.

eufy Floodlight Cam E340 Dual Lens

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