Verizon Fios uses fiber-optic technology to deliver some of the fastest home internet speeds available (up to 2 Gbps). Unlike cable internet, Fios has two key components — the ONT (Optical Network Terminal) and your router. When Fios stops working, you need to troubleshoot both.
⚡ Quick Fios Fix Checklist
- Check My Fios app for outage alerts
- Restart router AND ONT (60 second wait)
- Check Ethernet cable from ONT to router
- Verify ONT lights (Network light should be solid green)
- Run speed test on Ethernet to isolate WiFi vs fiber issues
Understanding Your Fios Setup
Fios internet has two critical devices:
- ONT (Optical Network Terminal) — Usually in your basement, garage, or outside wall. Converts fiber optic signals to Ethernet.
- Router (CR1000A/G3100) — Connects to ONT via Ethernet and provides WiFi to your home.
- The ONT may have a battery backup — if that battery is dead and power goes out, you lose internet.
Fix 1: Check for Fios Outage
- Open My Fios app → check for outage alerts
- Visit verizon.com/support
- Check Downdetector for Fios
- Call 1-800-VERIZON (1-800-837-4966) for automated outage status
Fix 2: Restart Your Router
- Unplug the router power cord
- Wait 60 seconds
- Plug back in and wait 5 minutes for full boot
- Check if the WiFi light turns solid white
Fix 3: Restart the ONT
This is the most effective Fios fix that most people skip:
- Locate your ONT (usually basement, garage, or utility closet)
- Unplug the power cord from the ONT
- If there's a battery backup, disconnect that too
- Wait 60 seconds
- Reconnect battery first, then power cord
- Wait 5 minutes for ONT to fully reconnect to Verizon's network
- Check that Network light turns solid green
💡 The ONT restart is the single most effective fix for Fios issues — it re-establishes the fiber connection to Verizon's central office.
Fix 4: Check Ethernet Cable (ONT to Router)
- The Ethernet cable from ONT to router is critical
- Check both ends — ensure solid click when inserted
- Try a different Ethernet cable (preferably Cat 6)
- Make sure it's plugged into the WAN port on the router
- If using a long cable run, check for damage or kinks
Fix 5: Check ONT Lights
| Light | Status | Action |
|---|---|---|
| Power | Green = OK | If off, check power connection |
| Battery | Green = charged, Red = low | Replace if red or flashing |
| Network | Green = fiber connected | If off = fiber outage, call Verizon |
| Internet | Green = active | If off, restart ONT |
Fix 6: Replace ONT Battery
- The ONT battery beeps when depleted — this is normal
- A dead battery doesn't affect internet unless power goes out
- However, a failing battery can sometimes cause intermittent disconnects
- To silence beeping: press the alarm silence button on the ONT
- Order replacement battery from Verizon or Amazon (model depends on your ONT)
Fix 7: Run Speed Test on Ethernet
This isolates whether the issue is WiFi or the actual fiber connection:
- Connect a computer directly to the router via Ethernet
- Run speedtest.net or fast.com
- Compare results to your Fios plan speed
- If Ethernet speed is good but WiFi is slow → WiFi issue (move router, change channel)
- If Ethernet speed is also slow → fiber/ONT issue (call Verizon)
Fix 8: Reset Network Settings
# Windows — Run as Administrator
ipconfig /flushdns
netsh winsock reset
netsh int ip reset
ipconfig /release
ipconfig /renew
Fix 9: Contact Verizon Fios Support
- Call 1-800-VERIZON (1-800-837-4966)
- Use My Fios app chat for faster response
- Ask them to run a remote diagnostic on your ONT
- If ONT Network light is off, request a technician visit (often free)
- Ask about upgrading to the latest CR1000A router for WiFi 6E
🌍 Fios Coverage Areas
Verizon Fios is available in New York, New Jersey, Connecticut, Pennsylvania, Virginia, Maryland, Massachusetts, Rhode Island, and Washington D.C. Most outage reports come from the NYC metro area and Northern Virginia.
Frequently Asked Questions
Why is my Verizon Fios internet not working?
Common causes: ONT (Optical Network Terminal) needs restart, area fiber outage, Ethernet cable between ONT and router loose, router firmware issue, account suspension, or the ONT battery backup is depleted and there's a power issue. Check the My Fios app for outage alerts first.
What is the ONT and how do I restart it?
The ONT (Optical Network Terminal) is the box usually in your basement or garage where the fiber optic cable enters your home. To restart: unplug the power cord (and battery if present), wait 60 seconds, plug back in. Wait 5 minutes for it to fully boot. The ONT converts fiber optic light signals into Ethernet/coax for your router.
What do the lights on my Fios ONT mean?
Power = solid green is good. Battery = green (charged), red (low). Network = solid green (connected), off (no fiber signal, call Verizon). Internet = solid green (active connection). If Network light is off, there's likely a fiber cut or area outage.
How fast should Verizon Fios actually be?
Fios plans range from 300 Mbps to 2 Gbps. You should get 80-95% of your plan speed on Ethernet. WiFi speeds are typically 50-70% of the plan speed depending on distance and interference. Run a speed test at speedtest.net connected via Ethernet to get accurate results.
Should I use the Verizon Fios router or my own?
The Verizon Fios CR1000A (WiFi 6E) is actually very good. But if you prefer your own, you can connect any router to the ONT's Ethernet port. You'll need to release the DHCP lease first: disconnect the Verizon router, connect yours, and it should get an IP within 2-3 minutes.
Verizon Fios Still Not Working?
Our certified technicians can diagnose and fix your Fios connection remotely in minutes.