Why Is My Kasa Smart Switch Clicking but Not Turning On?
- WiFi reconnect loop toggling the relay
- Loose load wiring (relay clicks, load doesn't switch)
- Conflicting schedules/automations
Problem Description
Your Kasa smart switch makes a clicking sound (the relay inside is switching) but the light doesn't turn on. The switch may not have power from the circuit. Check the circuit breaker for the light circuit. The click confirms the switch is receiving the command but the load side has no power or the wiring is incorrect.
Why This Happens in Real Homes
That clicking is the switch's internal relay physically toggling, and when it clicks but the light doesn't respond (or clicks repeatedly on its own), the usual cause is either a WiFi reconnect loop making it cycle, or a loose load wire so the relay switches but the circuit doesn't complete. Conflicting automations can also make it click unexpectedly.
Start by stabilizing WiFi — a switch that keeps dropping and reconnecting can toggle its relay each time — and check the load wiring is tight and correctly on the load terminal. Remove any conflicting schedules or automations, update firmware, and confirm the load is within the switch's rating. If it clicks but never switches the load even with good wiring, the relay may be failing and the switch needs replacing.
Symptoms
- Switch clicks but the light doesn't change
- Repeated relay clicking
- Clicks on and off by itself
- Light flickers with the clicking
- Clicking then offline
- No load switching despite clicks
- Rapid clicking
- Clicking after WiFi drops
Recognize these? Here's what usually causes it.
Common Causes
- WiFi reconnect loop toggling the relay
- Loose load wiring (relay clicks, load doesn't switch)
- Conflicting schedules/automations
- Firmware bug
- Underpowered/incompatible load
- Power fluctuations
- Line/load wiring issue
- Failing relay
Most fixes happen in the first 3 steps.
If you don't have a neutral wire, you'll need a no-neutral smart switch (like Lutron Caseta) instead of Kasa.
Step-by-Step Solution
Check the circuit breaker
If the Kasa switch makes a clicking sound but the light does not turn on, the relay inside the switch is activating but either there is no power to the load or the bulb itself is dead. Check the circuit breaker first. Then try replacing the bulb. If the switch clicks and a fresh bulb works, the original bulb was burned out.
Check the wiring connections
A loose wire nut inside the wall box can cause the switch to click (relay activates) but fail to deliver power to the load. Turn off the breaker, remove the switch plate, and check every wire connection. Tug gently on each wire to confirm they are secure in the wire nuts. A loose load wire is the most common cause of clicking without function.
Listen to the clicking pattern
A single click when you press the switch is normal — that is the relay engaging. Rapid repeated clicking (click-click-click) indicates the switch is resetting repeatedly, which usually means a wiring error. The switch may have the hot and load wires swapped, or the neutral is not properly connected. Compare your wiring against the installation diagram included with the switch.
Check if the switch works via the app
If the physical button clicks but nothing happens, try controlling the switch through the Kasa app. If the app can turn the light on and off but the physical button cannot, the button mechanism may be defective. If neither the app nor the button works but the relay clicks, the issue is wiring or a dead load. This test helps isolate whether the problem is the button, the relay, or the circuit.
Replace the switch if the relay is failing
If the switch clicks when toggled but power never reaches the fixture, and the wiring is confirmed correct with a multimeter, the internal relay contact may be burned or stuck. This happens over time, especially with high-wattage loads. The switch needs replacement. Contact TP-Link support for a warranty replacement if the switch is within the warranty period.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If this comes back after following these steps, check whether a recent app or firmware update reset a default setting — the fix works, but the setting gets reverted silently.
Always turn off the breaker before checking wiring. Smart switches can shock you even when the light is off.
This issue almost always looks more complex than it is — the majority of cases trace back to a single setting, a stale credential, or a default that shipped wrong.
- WiFi reconnect loop toggling the relay
- Loose load wiring (relay clicks, load doesn't switch)
- Conflicting schedules/automations
- Firmware bug
- Underpowered/incompatible load
Before you go — try one of these (they fix most cases).
Official Manufacturer Manual
TP-Link Kasa provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your TP-Link Kasa Smart Switch.
Source: tp-link.com
How Does TP-Link Kasa Compare?
Before replacing your TP-Link Kasa device, see how it stacks up against alternatives in our full comparison guides.
Accessories owners commonly pair with TP-Link Kasa Smart Switch.
Amazon Smart Plug, Works with Alexa, Simple Setup, Endles...
Sengled Smart Light Bulbs, Color Changing Alexa/Bluetooth...
Sengled Alexa Light Bulb, S1 Auto Pairing with Alexa Devi...
As an Amazon Associate we earn from qualifying purchases.
