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Internet & Wi-Fi troubleshooting

Router internet light is red

A red internet or WAN light usually means the router cannot establish a usable upstream connection to the modem or provider, but exact LED meanings vary by model.

Model check required. LED colors and labels vary. Use the exact router or gateway manual.
Reviewed Jul 17, 20264 minute guideRouter
Quick answer

A red internet or WAN light usually means the router cannot establish a usable upstream connection to the modem or provider, but exact LED meanings vary by model.

Start here: Read the LED legend for the exact model. Red can mean different conditions across brands.
Guided check

Match the symptom, then work through the safe checks.

0/4 checked

1. What best matches what you observe?

2. Complete only the checks that are safe for you.

4 user-level checks are available in this guide.Stop immediately if any warning condition applies.
Show stop conditions
  • A fiber connector or live coax line would need disassembly
  • The power supply or router smells burned

Likely causes

  • The modem or provider link is down
  • The WAN cable or port is disconnected or faulty
  • The router lacks valid provider authentication or address information
  • A firmware, account, or provisioning issue prevents connection

Quick checks, in order

Read the LED legend for the exact model

Red can mean different conditions across brands.

safe

Check the WAN cable and modem status

Reseat cables without moving fiber connectors.

safe

Power-cycle modem, then router

Wait for the modem to fully synchronize before starting the router.

safe

Contact the provider before factory reset

Provider provisioning or credentials may be required.

caution

What does the modem show?

The modem also shows a fault

The provider line or modem is the priority.

The modem is normal, router is red

Focus on the WAN cable, router port, credentials, or router state.

Internet works when connected directly to the modem

The router or its configuration is the likely problem.

Stop and get qualified help when

Do not continue troubleshooting if any of these apply:
  • A fiber connector or live coax line would need disassembly
  • The power supply or router smells burned

Official support and model manuals

Use the full model number from the rating label. The manufacturer manual is the deciding reference when codes differ by region or product family.

Wi-Fi Alliance knowledge center

Frequently asked questions

Does a red light always mean the router is broken?

No. It often means the upstream internet connection is unavailable.

Will a factory reset fix it?

Only if bad configuration is the cause; it can also erase provider settings.

Explore the problem space

Browse related code, device, and symptom hubs.

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