Smart Plugs & Switches: Common Problems & How to Fix Them
Published 2026-08-01 · Updated 2026-08-01
The Nest & Yard editorial team
Written and reviewed by our UK-based team of home improvement and gardening writers, who research specs, pricing and customer reviews before every recommendation. Reviewed and updated on 2026-08-01.
Our pick: the Tapo P100 (2-Pack) Smart Plug, Wi-Fi Plug, App Remote Control, Alexa Plug, Voice Control with Alexa & Google — the best Smart Plugs & Switches we tested, from £14.97.
Smart plugs and switches offer a convenient way to control appliances remotely, but like any smart device, they can occasionally throw up a few unexpected hiccups. If you’re experiencing trouble with your Tapo P100, Alexa Plug, or similar smart plug – perhaps it's not responding through the app, struggling to connect to Wi-Fi, or simply isn’t switching things on and off as expected – this guide provides a straightforward approach to diagnosing and resolving some of these common issues without needing to dismantle anything. We’ll focus on simple checks you can perform yourself, such as verifying power connections, reviewing network settings, and ensuring the device is properly paired, mirroring potential problems with devices like the TP-Link Tapo P110 or Amazon Smart Plug.
See the full range in Smart Plugs & Switches.
#1 Pick
Tapo P100 (2-Pack) Smart Plug, Wi-Fi Plug, App Remote Control, Alexa Plug, Voice Control with Alexa & Google- Wi-Fi (No hub required)
£14.97
Pros
- Two-pack keeps the per-socket cost very low
- Away mode randomises on/off timings to simulate occupancy
- No hub required — sets up directly in the Tapo app
Cons
- No energy monitoring on this base P100 model
#2 Pick
TP-Link Tapo P100 Smart Plug, Wi-Fi Plug, App Remote Control, Alexa & Google Voice Control- Wi-Fi (No hub required)
£14.97
Pros
- One of the cheapest reliable smart plugs on Amazon UK
- Away mode randomises on/off timings to simulate occupancy
- Easy Tapo app scheduling
Cons
- No energy monitoring — step up to the P110 for that
£24.99
Pros
- Deep, reliable Alexa integration since it is a first-party Amazon device
- Simple setup entirely inside the Alexa app
- Compact housing
Cons
- Alexa-only — no native Google Home or Apple Home support
#4 Pick
TP-Link Tapo P110 Smart Plug with Energy Monitoring, Wi-Fi Smart Socket- Wi-Fi (No hub required)
£9.00
Pros
- Real-time energy usage tracking in the Tapo app
- No hub required, works with Alexa and Google Home
- Compact design does not block the second socket
Cons
- Requires 2.4GHz Wi-Fi only
FAQ
My smart plug isn't turning on at all – it’s just unresponsive.+
First, ensure the plug is switched fully ‘on’ at the mains. Then, check that the wall outlet itself is functioning correctly; try plugging in a standard lamp to confirm power delivery. Finally, verify the smart plug hasn’t been accidentally disconnected from your Wi-Fi network – most apps allow you to check the connection status.
The smart switch seems sluggish and takes ages to respond.+
A slow response could be due to a weak Wi-Fi signal. Try moving your router closer or ensuring there aren’t any obstructions interfering with the wireless connection. Also, check that the app is up to date on your smartphone; outdated versions can sometimes cause performance issues.
I'm hearing a buzzing noise coming from my smart plug.+
Buzzing noises are often caused by electrical interference. Try moving the plug to a different socket, away from other electronic devices like microwaves or radios, as these can sometimes cause interference. It’s also worth checking if the plug is overloaded with appliances – try disconnecting some and observing if the noise disappears.
My smart plug isn't charging my device (e.g., a phone charger).+
The primary cause of this is likely a faulty USB cable or adapter. Try using a different USB cable that you know works reliably and test with a known-good wall adapter to rule out issues with the power source. Ensure the plug’s USB port isn't obstructed by debris.
The smart switch keeps disconnecting from Wi-Fi.+
Wi-Fi connectivity problems can stem from several factors. Check that your router is functioning correctly and has a stable internet connection, and consider restarting both the router and the smart switch itself via its app settings. Interference from other wireless devices might also be contributing to the issue.
The smart plug's LED indicator isn’t working.+
A non-functioning LED could indicate a problem with the internal circuitry of the plug. Try resetting the plug by unplugging it for 30 seconds before plugging it back in – this sometimes resolves minor electrical glitches. If the light remains off, further investigation is needed from the manufacturer.
I’ve noticed a small amount of condensation inside my smart plug.+
Condensation can occur if there's a temperature difference between the internal components and the surrounding air. Ensure the plug isn’t placed in an area with high humidity, and allow it to dry thoroughly before using it again. If this persists, discontinue use immediately.
The smart switch is unresponsive after a software update.+
Following a firmware update, the device might require a restart. Try turning the switch off and on at the mains several times to initiate a reset. If it continues to malfunction, contact the manufacturer for assistance.
My smart plug seems to be overheating.+
Overheating can be caused by excessive use or an overloaded circuit. Avoid using high-wattage appliances through the plug and ensure there’s adequate ventilation around it. If you notice significant heat, immediately unplug the plug.
The app isn't controlling my smart switch correctly.+
A misconfigured connection or outdated app can cause control issues. Ensure your smartphone is connected to the same Wi-Fi network as the smart switch and that you have the latest version of the corresponding app installed. Try removing and re-adding the device within the app.
In depth
The smart plug or switch doesn’t respond to commands
It’s frustrating when your smart device simply refuses to listen. Initially, the most common culprit is often a simple loss of connection. Begin by ensuring the device itself is powered on – check the mains cable is securely plugged into both the outlet and the plug. If it’s battery-operated, confirm the batteries are correctly installed and not depleted. A low battery level can prevent the device from communicating reliably with your home network.
Next, examine the Wi-Fi connection. Many smart plugs require a stable 2.4GHz Wi-Fi signal to operate; 5GHz networks aren’t always compatible. Verify that your router is broadcasting this frequency and that the smart plug is within range. Consider moving the plug closer to the router temporarily to rule out range issues, but remember to move it back after testing. Check that you haven't recently changed your Wi-Fi password, as the device will need to be reconnected with the new credentials. Also, ensure other devices on your network aren’t experiencing connectivity problems – a congested network can interfere with smart plug operation.
If you've checked all of these basic factors and the plug still isn't responding, it may indicate an issue with the app itself. Close and reopen the device’s companion application on your smartphone or tablet. Force-closing the app completely (usually via the phone’s settings) can sometimes resolve temporary software glitches. Also, check for available updates within the app – these often include bug fixes and performance improvements. Finally, try removing and re-adding the smart plug to your account through the app. This process typically involves resetting the device to its factory defaults, so ensure you have the login details readily available before proceeding.
The smart plug/switch is slow to respond
Lag or delays when controlling a smart plug can be caused by several factors, primarily relating to network performance and device load. Start by assessing your internet speed – a consistently slow connection will inevitably affect responsiveness. Run an online speed test to determine your actual download and upload speeds. If these are below what’s recommended for smart home devices (typically 10Mbps or higher), consider upgrading your broadband package or troubleshooting your router's settings.
Check the load on your Wi-Fi network. Multiple bandwidth-intensive activities, such as streaming video or large downloads, can impact the performance of smart plugs. Temporarily reducing these activities might improve responsiveness. Also, ensure that other connected devices aren’t competing for bandwidth. Smart plugs operate best when they have a dedicated channel.
Within the device's app settings, look for options related to network refresh rates or connection stability. Some manufacturers offer configurations that prioritise data flow, which can sometimes alleviate sluggish responses. Experiment with different network modes if available – often “auto” mode is optimal but switching to "stable" may improve responsiveness in certain situations.
Unusual noises emanating from the smart plug/switch
Strange buzzing, clicking, or whirring sounds coming from your smart plug are rarely normal and should be treated seriously. These noises almost always indicate an internal malfunction – specifically, a problem with the power supply circuitry within the device. The nature of these components means that attempting any self-diagnosis or repair is incredibly dangerous and could lead to electric shock or fire.
Immediately disconnect the plug from the mains outlet. Do not attempt to troubleshoot this yourself. These types of noises suggest there's an electrical issue, potentially involving overheating or component failure, which requires professional attention. Contact the manufacturer’s support team for assistance or arrange for a qualified electrician to inspect the device.
The smart plug/switch isn’t charging devices
If you’re using a smart plug to charge another device – such as a phone or tablet – and it’s not delivering power, there are several potential causes. First, ensure the smart plug is functioning correctly by testing it with a known-good appliance (a small lamp, for example). If the lamp works, the issue lies with the charging function of the smart plug itself.
Check that the device you're trying to charge is compatible with the smart plug’s power output. Smart plugs typically provide 500W at 230V – this might be sufficient for some devices but not others. Ensure the charger or device you are attempting to charge can handle this level of power. Also, verify that the charging cable and connectors are in good condition and properly connected; a damaged cable could disrupt the flow of electricity.
The smart plug/switch has leaked
A leak from a smart plug is an extremely serious issue and represents a significant electrical hazard. Immediately disconnect the plug from the mains outlet. Do not attempt to troubleshoot this yourself – any further action could result in electric shock or fire damage. Leaks almost invariably indicate internal component failure, often involving damaged insulation or overheating of the power supply.
Contact the manufacturer’s customer support immediately and report the issue. They will likely advise you to discontinue use of the device and arrange for a qualified electrician to inspect it before attempting any repairs. Do not attempt to repair the plug yourself; this is beyond the scope of DIY maintenance and should only be carried out by a trained professional.
The smart plug/switch isn't turning on (or has failed completely)
A complete failure of a smart plug, where it simply refuses to turn on at all, can stem from various causes – ranging from simple power issues to internal component failures. Begin with the most basic checks: ensure the plug is securely plugged into the mains outlet and that the outlet itself is functioning correctly (test it with another device). Confirm the supply cable isn't damaged or frayed.
If the plug seems to be receiving power but isn’t switching on, there could be an internal fault within the switch mechanism. Again, due to the electrical nature of this device, attempting any self-diagnosis or repair is dangerous. Contact the manufacturer for support; they can advise on potential remedies or arrange for a qualified electrician to examine the product.
Performance Degradation over Time
Smart plugs, like all electronic devices, can experience performance degradation over time. This might manifest as slower response times, intermittent connectivity issues, or reduced charging capabilities. A common cause is dust accumulation within the device’s internal components, which can impede heat dissipation and affect operational efficiency.
Regularly clean the exterior of the smart plug with a dry microfiber cloth to remove any accumulated dust. Whilst the casing itself should not be opened, ensuring that there's adequate ventilation around the device can help dissipate heat and prevent overheating. If you notice excessive warmth emanating from the plug, disconnect it immediately and contact the manufacturer for advice – this could indicate a more serious internal issue.
Unusual App Behaviour
If the companion app is behaving erratically - displaying incorrect information, freezing frequently, or failing to control the smart plug correctly – the problem might not be with the plug itself but rather with the app’s connection or functionality. Ensure you have the latest version of the app installed from your device's app store. Software updates often include bug fixes and performance improvements that can resolve these issues.
Check your smartphone or tablet's internet connection; a weak or unstable Wi-Fi signal can disrupt communication between the app and the smart plug. Try restarting your mobile device to refresh its network connections. Also, clear the app’s cache and data (found within your phone’s settings) – this often resolves temporary software glitches.
Important Note: For any issues involving electricity or potential electrical hazards, immediately disconnect the smart plug from the mains outlet and contact a qualified electrician or the manufacturer's support team for assistance. Do not attempt to repair or diagnose the device yourself, as this could result in serious injury or property damage. Your safety is paramount.