Internet Not Working? Common Problems and Fixes
Facing WiFi connected but no internet, slow internet, buffering, frequent disconnection, router problem or LOS red light? This guide explains common broadband issues and quick checks before raising a complaint.
WiFi Connected, No Internet
Could be router, ONT, plan, device or ISP-side issue.
Slow Speed
Often caused by weak WiFi, old router, too many devices or poor placement.
LOS Red Light
Usually means fiber signal loss and may need line-side checking.
WiFi Connected But No Internet
This is one of the most common broadband problems. Your phone or laptop may show WiFi connected, but websites and apps do not load. This means the device is connected to the router, but the router may not be getting internet properly.
Possible reasons:
- Router or ONT needs restart
- Fiber signal issue
- Internet session issue
- Expired or inactive plan
- DNS issue
- Device-specific problem
- Area-side broadband outage
Quick checks:
- Restart router/ONT once
- Check whether other devices also have no internet
- Check whether LOS light is red
- Try mobile and laptop both
- Check if payment or plan validity is active
Internet Slow Even With High-Speed Plan
If your broadband plan is 100 Mbps or 200 Mbps but internet feels slow, the issue may not always be the fiber line. Many slow speed complaints are caused by home WiFi issues.
Common causes:
- Router placed in a corner or closed shelf
- Old single-band router
- Too many connected devices
- Using 2.4GHz instead of 5GHz for speed-heavy devices
- Weak signal in bedrooms or far rooms
- Background downloads or app updates
- Device limitation
Read our WiFi router guide and internet speed guide for deeper explanation.
Frequent Internet Disconnection
If internet disconnects often, note whether the WiFi itself disconnects or the internet stops while WiFi remains connected. Both point to different causes.
| Problem | Likely Cause | What To Check |
|---|---|---|
| WiFi disconnects from phone | Router range or device issue | Router placement, WiFi band, device |
| WiFi connected but internet stops | Router, ONT or ISP issue | Restart, LOS light, other devices |
| LOS red light | Fiber signal loss | Patch cord, fiber line, support |
| Slow only in one room | Weak WiFi coverage | Router placement or mesh WiFi |
LOS Light Blinking Red
If LOS light is blinking red on your ONT or fiber router, it usually means Loss Of Signal. This means the fiber signal is not reaching the ONT properly.
This is usually not a normal WiFi issue. It may be due to fiber cable cut, loose patch cord, splitter issue or line-side problem. Read the full LOS red light guide.
Buffering on OTT, IPTV or Smart TV
OTT buffering can happen even when your internet plan is good. Smart TVs are often placed far from the router, and weak WiFi signal can cause buffering during movies, sports or live TV.
Try these checks:
- Move router to a central location
- Use 5GHz WiFi if TV is near the router
- Use LAN cable for smart TV if possible
- Reduce background downloads
- Upgrade to dual-band router or mesh WiFi for larger homes
For entertainment plans, check broadband with OTT, IPTV plans in Chennai and Krishii Fiber plans.
Quick Troubleshooting Checklist
- Restart router/ONT once
- Check power adapter and cable
- Check if LOS light is red
- Check internet on multiple devices
- Check whether only one app/site is affected
- Move closer to router and test speed
- Try 5GHz WiFi if available
- Check if nearby users are also affected
- Contact support if issue continues
When Should You Contact Support?
You should contact broadband support if:
- LOS light is red
- Internet is not working on all devices
- Router restart does not help
- Disconnection repeats frequently
- Nearby users are also affected
- Fiber patch cord looks damaged
- Speed is very low even near the router
Related Guides and Useful Pages
Final Recommendation
Most internet problems can be understood by checking three things: router power, WiFi signal and LOS light. If WiFi is weak only in one room, improve router placement or use mesh WiFi. If LOS is red, it is likely a fiber signal issue. If all devices have no internet, contact support after one restart and basic cable checks.
Internet Issues FAQ
Why is my WiFi connected but internet not working?
WiFi connected but no internet can happen due to router issue, ONT issue, ISP-side outage, cable problem, expired plan, DNS issue or device-side problem.
Why is my internet slow even with a high-speed plan?
Internet may feel slow because of poor router placement, weak WiFi signal, too many connected devices, old router, 2.4GHz congestion, background downloads or area-side issue.
What does red LOS light mean?
Red LOS light usually means Loss Of Signal. The fiber signal is not reaching the ONT/router properly and may need line-side checking.
How do I fix frequent internet disconnection?
Restart the router once, check cables, check if LOS is red, test with another device, reduce router overheating and contact support if the issue continues.
When should I contact broadband support?
Contact support if LOS is red, internet is down for all devices, disconnection repeats frequently, nearby users are affected or basic restart and cable checks do not help.
Internet Still Not Working?
Existing Krishii Fiber customers can send registered mobile number, area and router light photo for faster support.
Report Issue on WhatsApp