Router Lights Meaning + Quick Internet Troubleshooting Guide
Those blinking lights on your router (or fiber ONT) aren't random — each one tells you exactly what's working and what isn't. Learn to read them and you can diagnose most internet problems in seconds, before you even call support. Here's what each light means and how to fix common issues.
What Each Router / ONT Light Means
| Light | Healthy state | What it means |
|---|---|---|
| Power | Steady | Device is on and getting electricity |
| PON | Steady green | Fiber link to the ISP is established |
| LOS | Off | Red = Loss of Signal (fiber broken/outage) |
| Internet / WAN | Steady/blinking green | Connected to the internet |
| WiFi / WLAN | Blinking green | WiFi is on and active |
| LAN / 1-4 | On when used | A device is plugged in by cable |
Colours can vary slightly by brand, but this covers most fiber routers used in Bilimora homes.
Reading the Lights — Quick Diagnosis
- All normal but no internet on devices: likely a WiFi issue — see WiFi speed tips or restart the router.
- Internet/WAN light off, PON green: the fiber is fine but the connection isn't authenticating — restart, then contact your ISP.
- PON off or blinking, LOS red: fiber signal lost — a cut/unplugged fiber or an area outage. Contact your ISP.
- Power light off: check the adapter, socket and switch.
Quick Troubleshooting Steps (In Order)
- Check the lights against the table above to see where the break is.
- Restart the router/ONT — power off for 30 seconds, back on, wait 1–2 minutes.
- Check the cables — make sure the fiber and power cables are firmly seated (don't sharply bend fiber).
- Check if it's an area outage — ask a neighbour on the same ISP, or check the provider's status page. Nisan customers can view the live network status.
- Test on one device to confirm it's not just one phone or laptop.
- Still down? Contact your ISP with what the lights show — it speeds up the fix.
Why Local Support Fixes It Faster
When the lights show a real line fault, how fast it's fixed depends on your provider. A national ISP gives a ticket and a 24–48 hour window. A local provider like Nisan sends a Bilimora technician — usually the same day, 365 days a year. See also how to handle an internet outage.
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Call: 98251 52400 WhatsApp UsFrequently Asked Questions
What does a red LOS light on my router mean?
A red or blinking LOS (Loss of Signal) light on a fiber ONT means the fiber connection is broken — often a cut or unplugged fiber cable, or an area outage. Restarting won't fix a red LOS; contact your ISP. Nisan customers can call or WhatsApp +91 98251 52400.
What do the lights on a router mean?
Typical lights are: Power (device on), PON (fiber link established), LOS (should be off — red means signal lost), Internet/WAN (connected to internet), WiFi (wireless active), and LAN (a device plugged in via cable). Steady green usually means healthy; red or off on PON/Internet means a problem.
How do I fix my internet when it stops working?
Check the router lights, restart the router (power off 30 seconds), check all cables are firmly connected, and confirm it isn't an area outage. If the LOS light is red or the PON light is off, it's a line issue — contact your ISP.
Should I restart my router to fix problems?
Yes — restarting the router fixes many temporary glitches. Power it off for 30 seconds, then back on and wait 1–2 minutes for it to reconnect. If lights still show a fault after restarting, contact your provider.