Why Wi-Fi isn't working at home: a complete diagnosis and 12 ways to fix it

You're sitting on the couch with your laptop, trying to open an important document, but the browser stubbornly displays "No internet connection." Or your smartphone suddenly loses network connectivity, even though everything was working just a minute ago. Sound familiar? Problems with home Wi-Fi are one of the most common tech headaches faced by every second user. There can be dozens of causes, from the mundane failure in router settings to hidden radio interference from the microwave or neighbors' networks.

In this article, we will not just list possible malfunctions, but also conduct step-by-step diagnostics — from simple to complex. You'll learn how to distinguish a hardware failure from a software glitch, and why 5 GHz routers are more likely to malfunction in apartment buildings., and what to do if you have internet access but pages won't load. Finally, a quick checklist and answers to frequently asked questions that aren't even covered in the equipment manuals.

1. Check the obvious: power, cables and indicators

Start with the basics: make sure the router is turned onIt sounds trivial, but in 15% of cases, the problem is solved this way—someone in the household may have accidentally pulled the plug or pressed the power button on the device. Pay attention to the indicators:

• 🟢 Green/blue LED "Power" — the router receives power.
• 🟡 Yellow/flashing "Internet" — problems connecting to the provider.
• 🔴 Red "Wi-Fi" — the wireless network module is disabled or faulty.
• ⚪ No indication — the power supply or the router itself is faulty.

If the indicators are not lit as usual, try unplug the power supply from the socket for 30 seconds, then reconnect. This will clear the temporary errors. Also check cable from the provider (usually connected to a port WAN/Internet): it should fit snugly, without kinks. If there is visible physical damage (kinks, breaks in the braid), replace the cable—this is a common cause. periodic connection breaks.

⚠️ Caution: If the router does not turn on at all after powering off (no indicators, no heat), do not attempt to disassemble it yourself. This may indicate capacitor breakdown or damage to the board - in such cases, professional repair is required.

2. Rebooting the router and devices: when it really helps

A power reset (also known as a "cold reboot") solves up to 40% of Wi-Fi problems. But there are some caveats:

1. The correct sequence is:
   1. Turn off the power of the router.
   2. Remove the provider cable from the port WAN.
   3. Please wait 1 minute.
   4. Connect the provider cable back.
   5. Turn on the power of the router.
2. Reboot your device: A laptop, smartphone, or Smart TV may also become stuck on an old IP address. Disable Wi-Fi on the device, reboot it, and then reconnect.

If the network appears after rebooting, but the speed is noticeably lower than usual, check Wi-Fi channel in the router settings (more on this in Section 5). It's also worth updating the router firmware—outdated software is often the cause. spontaneous connection breaks.

Turned the router off and on|Checked the cables for damage|Rebooted the device (PC/smartphone)|Tried connecting from another device|Made sure the Internet was paid for-->

3. Problems on the provider's side: how to check and what to do

Sometimes it's not your router's fault, but the provider's line was cut off or scheduled work. To rule out this option:

• 📞 Call your provider's support team (the number is usually listed on your contract or on a sticker on your router). Ask if there's accidents on your line.
• 🌐 Try accessing your provider's website via mobile data (not Wi-Fi!). If the website doesn't open, the problem is definitely not yours.
• 📡 Connect the provider's cable directly to the computer (into the port Ethernet). If the Internet doesn't work, it's the provider's fault.

If the provider confirms the problem, write down the ticket number and the timeframe for fixing it. In apartment buildings, common causes are: cable damage in the entrance or equipment overload (especially in the evening). If the problem occurs regularly, demand reconnecting to another switch or change of technology (for example, with ADSL on GPON).

⚠️ Note: Some providers block access for non-payment, but don't always send notifications. Check your account balance—sometimes topping up your account by 1 ruble is enough to unblock the connection.

4. IP address conflicts and DHCP failures

If the router distributes the Internet, but devices cannot connect (it says "Obtaining IP address" or "Authentication"), the culprit is IP allocation failureThis happens when:

• 🔄 The router does not have time to release the old IP for the new device.
• 🤖 There is a device on the network with static IP, which conflicts with the dynamic one.
• ⚡ There was a sudden power outage.

How to fix:

1. Go to your router settings (usually at 192.168.0.1 or 192.168.1.1, login/password - on the sticker).
2. Find the section DHCP (or Local area network).
3. Make sure the DHCP server included and the range of addresses is not exhausted (for example, with 192.168.0.100 to 192.168.0.200).
4. Save the settings and reboot the router.

If the issue is specific to a specific device (for example, only a smartphone), go to its Wi-Fi settings, find your network, click "Forget," and reconnect. On Windows, run the following in the command line:

ipconfig /release
ipconfig /renew

5. Interference and channel congestion: why Wi-Fi slows down in the evening

In apartment buildings the main reason is unstable Wi-Fi — airwave congestionThe problem is that all of my neighbors' routers broadcast on a limited number of channels (only 13 in the 2.4 GHz band, and up to 25 in the 5 GHz band). If 10+ networks are operating on a single channel, the speed drops significantly.

How to check and fix:

1. Install the application on your smartphone Wi-Fi Analyzer (Android) or NetSpot (iOS).
2. Look at which channels are the busiest (there will be tall bars on the graph).
3. In the router settings (Wireless Network → Channel) select least busy (for example, if everyone is sitting on 6th, move to 1st or 11th).
4. For the 5 GHz band, select channels 36-48 or 149-165 - they are less in demand.

Also pay attention to channel width:

• 📶 20 MHz — the most stable, but slowest option.
• 📶📶 40 MHz - balance of speed and stability.
• 📶📶📶 80 MHz (5GHz only) - maximum speed, but susceptible to interference.

⚠️ Attention: If you have a dual-band router (dual band), try disabling the 5 GHz network and leaving only 2.4 GHz - sometimes devices (especially older smartphones) conflict with automatic switching between ranges.

Why is 5 GHz reception worse in the next room?

The 5 GHz band has a shorter wavelength, so it's more easily absorbed by walls and furniture. If you have thick concrete partitions, the signal may not penetrate even at a distance of 5-7 meters. The solution is to use Mesh systems or repeaters with 5 GHz support.

6. Hardware malfunctions: when should you take your router in for repair?

If none of the previous methods helped, the problem may be in ironSigns of hardware failure:

• 🔥 The router gets very hot (hot even after 10 minutes of operation).
• 📉 The speed via cable is normal, but via Wi-Fi it is 10 times slower.
• 🔄 The network disappears with the slightest movement of the router (poor antenna contact).
• ⚡ The indicators flash randomly or do not light at all.

Frequent breakdowns:

If the router is older than 5 years, repairing it may not be cost-effective - it is cheaper to buy a new one (for example, TP-Link Archer AX21 or Xiaomi AX3000). For a temporary solution, use the router in standby mode. bridge (WDS), connecting it to the main one via cable.

7. External interference: microwaves, Bluetooth, and neighbors

Few people know, but household appliances can seriously interfere with Wi-Fi:

• 🍳 Microwave ovens They operate at a frequency of 2.4 GHz and "jam" the signal if the router is located nearby.
• 📱 Bluetooth speakers and headsets create interference in the 2.4 GHz range.
• 🔌 Wireless charging and Wi-Fi-controlled LED lamps also emit radio waves.
• 🏢 Reinforced concrete walls or mirrors weaken the signal by 50-70%.

Solutions:

1. Move the router to central place in the apartment, away from the kitchen and metal objects.
2. Use 5 GHz for devices that support this range (eg iPhone 6s and newer, Samsung Galaxy S8+).
3. If your neighbors use powerful routers (for example, ASUS RT-AX88U), try reduce the transmit power in the settings of your device (option Transmit Power).

To check the interference level, use the app WiFi SweetSpots (iOS) or NetSpot (Windows/macOS) If the signal is weaker -70 dBm, it's worth considering purchasing repeater or Mesh systems (For example, TP-Link Deco).

8. Viruses, VPNs, and device settings

Sometimes the problem is not in the router, but in infected device or incorrect settings:

• 🦠 Viruses may be overloading the network with suspicious traffic. Check your device. Malwarebytes or built-in antivirus.
• 🔒 VPN services Sometimes local traffic is blocked. Disable your VPN and check your connection.
• 📱 On Android go to Settings → Network → Advanced → Manage networks and reset your Wi-Fi settings.
• 🖥 On Windows run in command line:

  netsh winsock reset
  netsh int ip reset

If the problem appeared after updating Windows or macOS, check your settings. firewall - Sometimes it blocks access to the local network. Windows 11 it's done like this:

1. Open Settings → Network & Internet → Windows Defender Firewall.
2. Select Allow interaction with the application.
3. Make sure the checkboxes for your network are enabled. Private And Public.

⚠️ Warning: If you use pirated firmware on the router (for example, DD-WRT or OpenWRT), the failure may be due to an incorrect configuration. Revert to the stock firmware or update the alternative firmware to the latest version.

FAQ: Answers to Frequently Asked Questions

🔍 Why is Wi-Fi working but the internet isn't?

This means the router is distributing the local network but can't connect to the ISP. Reasons:

• Internet bill not paid (check balance).
• The cable from the provider is damaged (check the indicator Internet on the router).
• Authentication failure (re-save the login/password from the provider in the router settings).

Solution: Connect your ISP's cable directly to your computer. If the internet still doesn't work, call support.

📶 How do I know what router I have?

Look at the sticker on the bottom of the router - it indicates the model (for example, TP-Link TL-WR841N). You can also:

• Go to settings at the address 192.168.0.1 (login/password usually admin/admin).
• Use the app Fing (scans the network and shows the router model).

⚡ Why does Wi-Fi turn off at night?

Possible reasons:

• It's enabled in the router settings. Schedule (time-based shutdown).
• The provider is carrying out technical work (usually from 00:00 to 6:00).
• Economy mode on the router (disabled when idle).

Solution: Go to your router settings (System Tools → Schedule) and disable automatic shutdown.

🖧 Can I use a router without antennas?

Technically yes, but:

• Without antennas, the signal strength will drop 5-10 times.
• The connection speed will be limited. 54 Mbps (802.11g standard).
• The number will increase packet loss (sites will take a long time to load).

If the antenna is broken, replace it with a similar one (you can buy one on AliExpress based on your router model).

🛡 How to protect your Wi-Fi from your neighbors?

To prevent unauthorized connections:

1. Change the security standard to WPA3-PSK (in settings Wireless Network → Security).
2. Turn it off WPS - This protocol is vulnerable to hacking.
3. Hiding the SSID (network name) is pointless—it doesn't protect against hacking, but only makes it more difficult for legitimate devices to connect.
4. Turn on MAC address filtering (but remember that MAC is easy to fake).

The most reliable way is to use guest network for IoT devices (smart bulbs, cameras) and a core network with a complex password for personal gadgets.