Smart Home Down After a Router or Broadband Change?
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Smart Home Down After a Router or Broadband Change?

Swapping your router or changing broadband provider is one of the most common reasons smart home systems stop working. Crestron, Lutron, and Control4 all depend on specific network settings — and a new router resets the lot. The good news: it's completely fixable.

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Sound familiar?

You upgraded your broadband or your ISP sent a new router, and now your smart home has fallen apart. The Wi-Fi works fine for phones and laptops, but your lighting, heating, and AV control have stopped responding. This is one of the most common calls we get — and one of the most straightforward to fix.

The app can't find your system any more

Your Control4 app says 'No Systems Found,' your Crestron Home app won't connect, or your Lutron app has lost the processor. The new router has assigned different IP addresses to everything, and the app doesn't know where to look.

Keypads and wall switches still work but nothing else does

Lutron keypads communicate via radio frequency directly to the processor, so they often keep working. But anything that relies on the network — apps, touchscreens, voice control, remote access — is broken because the network has changed.

Voice control and smart speakers have disconnected

Alexa and Google Home integrations link to your smart home system via the network. A new router means new network credentials, and every integration needs to be re-established — from Alexa skills to Google Home device links.

Remote access no longer works

You could control your home from your phone when you were away, but now it's dead. Remote access relies on specific port forwarding rules or cloud relay settings that were configured on your old router and don't exist on the new one.

Some devices work but others have dropped off

Your system is partially functional — maybe the main rooms work but not the bedrooms, or the lighting is fine but AV won't respond. Devices with static IPs on the old subnet can't communicate on the new one.

The broadband engineer said everything looks fine

It does — from their perspective. Your internet connection is working. But your smart home system needs much more than just internet: it needs the right subnet, the right IP reservations, the right VLAN configuration, and specific ports open. The broadband engineer doesn't configure any of that.

How We Fix It

We reconfigure your smart home system to work perfectly with your new network — and make it resilient to future changes.

1

Tell Us What Changed

Let us know which broadband provider you've moved to, whether you have a new router, and which parts of your smart home have stopped working. If you know your system brand (Crestron, Lutron, or Control4), that helps — but we can identify it from a photo of your keypad or rack.

2

Network Assessment

We map your current network setup — router model, subnet, DHCP range, and any managed switches or wireless access points. Then we identify exactly what your smart home system needs: static IP reservations, VLAN settings, multicast support, and port forwarding rules.

3

Reconfigure & Reconnect

We update the IP addresses on your Crestron processor, Lutron QSX, or Control4 controller to match the new network. We re-establish device communication, restore app connectivity, reconfigure remote access, and re-link voice control integrations.

4

Future-Proof Your Setup

We set DHCP reservations for every device so IP addresses don't change again, document your network configuration, and provide you with a simple reference sheet. If you ever change routers again, the transition will be much smoother.

Changed Your Router and Lost Your Smart Home?

Free initial assessment. No obligation. Most issues resolved in a single visit.

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“We switched from BT to Zen and got a new router. Within an hour, our entire Control4 system was dead — no app, no touchscreens, no Alexa control. They came out the next day, reconfigured everything on the new network, set up proper IP reservations, and it's been rock solid since. They also explained why it happened, which was really helpful.”

Andrew C. Hertfordshire

“Our Lutron lighting system stopped responding after a Virgin Media hub upgrade. The keypads still worked but the app was useless and we couldn't control anything remotely. They remoted in, discovered the processor had a static IP from the old subnet, and had it sorted in under two hours. Brilliant.”

Emma & Tom S. Bristol

“After switching to a new mesh Wi-Fi system, our Crestron setup lost the plot completely — touchscreens offline, AV wouldn't switch, blinds stopped. The engineer reconfigured the whole network layer, set VLANs up properly for the first time, and now it's faster and more reliable than it was before the change.”

Priya N. West London

Frequently Asked Questions

Your smart home system communicates over your local network using specific IP addresses, subnet settings, and sometimes VLANs. When you change your router, the new one assigns completely different IP addresses, may use a different subnet range (e.g., 192.168.1.x instead of 192.168.0.x), and won't have any of the port forwarding or DHCP reservation rules your old router had. Your smart home devices literally can't find each other any more.

If you're comfortable with network configuration, you could try setting your new router to use the same subnet and SSID as your old one. However, professional smart home systems often need specific DHCP reservations, multicast settings, IGMP snooping configuration, and sometimes VLAN separation. Getting any of these wrong can cause intermittent faults that are very difficult to diagnose.

No. Your lighting scenes, automation schedules, and system programming are all stored on the Crestron, Lutron, or Control4 processor — not on the router. We're simply reconnecting your system to the new network. All your settings will be exactly as they were.

It depends. If your processor has picked up a valid IP address on the new network (even if it's wrong for the apps), we may be able to remote in and fix it. If the processor has no network connection at all, we'll need to attend site. We'll ask you to check for indicator lights on the processor to determine this before booking a visit.

Your broadband provider is correct that your internet connection is working. But your smart home system needs much more than internet access. It needs correctly configured local network settings, IP reservations, and often specific router features enabled. Broadband engineers configure internet connectivity, not smart home networking — these are two very different things.

It wouldn't have helped much. Most broadband providers don't configure customer networks beyond basic internet access. The real solution is to have your smart home engineer involved in any network change. We can pre-configure the new router before the switch, making the transition seamless.

We document your entire network configuration — IP reservations, VLAN settings, port forwarding rules, and DHCP ranges — and provide you with a reference sheet. Before any future router change, we can pre-configure the replacement so your smart home transitions without disruption. Clients on our maintenance contract get this included.

Changed Your Router and Lost Your Smart Home?

Free initial assessment. No obligation. Most issues resolved in a single visit.

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