WiFi Troubleshooting Decision Tree
Pick what is wrong, what changed recently, and whether a wired test is also slow. The tool returns the three most likely causes for your exact situation, with concrete fix steps and links to deeper-dive tools and guides.
For a slow-speed deep dive once you know the cause, see How to Fix Slow Wi-Fi at Home.
Diagnose your WiFi problem
Choose the option in each row that best matches what you are seeing. Results update instantly with a ranked top-3 of likely causes and the fix steps for the most likely one.
Top cause: ISP capacity issue
For whole-house slow speeds with no recent change, where wired is also slow.
How to use this tool
Match each row to what you are seeing, starting with the primary symptom. The tool weighs your answers against a fault matrix and ranks the three most likely causes, then lists concrete fix steps for the most likely one. Work the fixes top to bottom; if cause #1 does not solve it, move to cause #2, then cause #3.
The 10-minute diagnostic sequence
Before changing settings, run this four-step test. Each step rules out one layer, so by the end you know whether the problem is your ISP line, your router, your coverage, or one device.
- Wired speedtest (2 min). Plug a laptop straight into the modem or gateway with Ethernet and run a speedtest. If this is slow too, the problem is your ISP line or modem, not Wi-Fi.
- Wireless near the router (2 min). Stand next to the router and run the same test on Wi-Fi. If wired was fast but this is slow, the router config or band is the issue.
- Wireless away from the router (3 min). Move to the problem room and test again. A big drop here points to coverage or building materials, not the connection.
- Device-specific check (3 min). Test the one device that struggles against a second device in the same spot. If only the first is slow, the device, not the network, is the bottleneck.
What the speedtest numbers mean
A high download number alone does not mean a healthy connection. Read all four values.
| Number | What it measures | What is good |
|---|---|---|
| Download | Speed of data coming to you (streaming, browsing, downloads) | Within 80% of your plan over Wi-Fi near the router |
| Upload | Speed of data leaving you (video calls, cloud backups, posting) | Matches your plan's upload rate |
| Latency / ping | Delay before data starts moving, in milliseconds | Under 30 ms for gaming and calls; lower is better |
| Jitter | How much the latency varies between samples | Low and steady; high jitter causes call dropouts even at high speed |
Tips for success
- Test one change at a time. Apply a fix, then retest before trying the next. Changing three things at once tells you nothing about which one helped.
- Always do the wired test. It is the single most useful step. It instantly separates an ISP or modem problem from a Wi-Fi problem.
- Factory reset is a last resort, not a first step. It wipes your settings. A power cycle, firmware update, or channel change fixes most issues without erasing your configuration.
- Note what changed recently. A new device, a router swap, a firmware update, or a provider change is often the real trigger, even if the symptom shows up days later.
Common mistakes
- Calling the ISP before testing wired. If Wi-Fi is slow but a wired test is fast, the line is fine and the ISP cannot help. Test first.
- Buying a mesh kit to fix a slow plan. Mesh fixes coverage, not raw speed. A 25 Mbps plan with perfect mesh is still 25 Mbps.
- Factory-resetting a working router. This erases your settings and rarely fixes interference or coverage. Reserve it for genuinely corrupted configs.
- Leaving every device on 2.4 GHz. The 2.4 GHz band is slower and more congested. Move close-range phones, laptops, and streamers to 5 GHz.
- Ignoring the modem lights. A blinking or red status light usually means the problem is upstream of your router, before any Wi-Fi setting matters.
Canada: when the ISP is the problem
If the tool points to an ISP capacity or outage issue and your Canadian provider cannot resolve it, you have backstops.
- Name the provider. Bell, Telus, Rogers, Shaw, Cogeco, Eastlink, and Videotron all run status pages and support lines. Provincial market dominance differs, but the troubleshooting is the same.
- File with the CCTS after about 30 days. The Commission for Complaints for Telecom-television Services handles unresolved internet and phone complaints for free.
- Know the CRTC target. The regulator's universal-service objective sets a 50/10 Mbps minimum, so rural Atlantic and prairie homes below that have a benchmark to cite.
- Harden while you are in the settings. If you are already logged into the router, read How to Secure Your Home WiFi so the fix also closes security holes.
FAQ
What is the fastest way to find out what is wrong with my WiFi?
Run the 10-minute diagnostic: a wired speedtest plugged straight into the modem, then wireless next to the router, then wireless in the problem room, then the one device that struggles. Each step rules out a layer, so by the end you know whether the problem is your ISP line, your router, your coverage, or one device.
What do the speedtest numbers actually mean?
Download is data coming to you, upload is data leaving you, latency or ping is the delay in milliseconds (lower is better), and jitter is how much that delay varies. A high download with high latency or jitter still produces laggy calls, so do not judge a connection on download alone.
Should I factory-reset my router to fix WiFi problems?
A factory reset is a last resort, not a first step. It wipes your settings and forces a full re-setup. Try a power cycle, a firmware update, and a channel change first. Only factory-reset when a new router will not connect at all or the configuration is clearly corrupted.
What can I do in Canada if my ISP will not fix the problem?
If a Canadian provider (Bell, Telus, Rogers, Shaw, Cogeco, Eastlink, Videotron) cannot resolve a service issue after about 30 days, file a free complaint with the CCTS. The CRTC is the federal regulator, and its universal-service objective targets 50/10 Mbps for all homes.
My wired connection is fine but WiFi is slow. Where do I start?
If wired is fast and only Wi-Fi is slow, the problem is on the wireless side: band selection, channel congestion, coverage, or one device. Move close-range devices to 5 GHz, change to a clear 2.4 GHz channel (1, 6, or 11), and check coverage in the weak rooms before blaming your ISP.
Bottom line
Most home Wi-Fi problems come down to one of a handful of causes: the ISP line, the router config or band, coverage, interference, a hardware fault, or a single device. Start with the wired test, work the ranked fixes one at a time, and save the factory reset for last. For the slow-speed deep dive, pair this with How to Fix Slow Wi-Fi at Home, and size coverage with the Mesh Wi-Fi Coverage Calculator.