Common problems with older smart homes and how they get fixed
Older smart homes usually go wrong in a few places. Switches stop responding, lights get stuck on or off, the air conditioning (AC) ignores your settings, or the whole system stops answering the app. You can check some of these yourself. Faults in the wiring, the central controller or the AC unit need a technician.
This guide explains what tends to fail as a system ages, what each problem usually means and how a technician fixes it. We wrote it for homeowners in Dubai villas and apartments, and for the people who manage those homes for them.
Why older systems start to go wrong
Most smart home systems are a mix of parts. Wall switches, small control modules behind them or in a cabinet, a hub (the small box that links your devices) and an app all work together. Each part ages at its own rate.
- Electronics wear out. Power supplies and relays (small switches inside a module that turn the power on and off) can fail after years of use. A hot cabinet may add to the wear, so a technician can check it against the temperature range in the maker's data sheet.
- Software stops being updated. Makers stop releasing firmware (the software inside a device) and app updates for older models.
- Your network changes. A new router, Wi-Fi name, password or internet provider can cut devices off from the hub.
- The original installer has gone. Settings, passwords and drawings often left with them.
- Parts get swapped for the wrong ones. A standard bulb or switch fitted during other work may not work with the system.
Switches that do nothing
A switch that does nothing usually has one of three causes. It has lost its link to the hub, its power module has failed, or the cable connecting it to the system has a fault.
If only one switch is dead, the fault is usually in that switch or its module. If a whole room or floor stops at once, look further back, at a power supply, a controller or the network.
Wireless switches can drop offline when the signal is weak or the hub has moved. Wired systems such as KNX (a standard where switches talk over a dedicated cable) can fail at one power supply that feeds many switches.
A technician tests the switch, its module and the cable, then replaces the failed part. If your model is no longer made, they look for one that works with your system. Our guide to a smart switch not working takes you through the checks in order.
Lights stuck on, off or flickering
Lights that stay on, will not come on or flicker usually point to a dimmer module (the part that sets brightness) or to the bulbs themselves.
- Not every dimmable LED bulb works well with every dimmer. Lutron, for example, tests bulbs with its own dimmers and lists the ones that work in an online tool. Flicker or buzzing after new bulbs go in is a sign to check this.
- Lights that come on by themselves are often following an old scene (a saved group of light settings) or a timer still stored in the system.
- Lights stuck fully on can mean a relay inside the module has failed in the closed position.
- You can try a compatible bulb and look for old timers in the app.
- A failed module needs a technician. It runs on mains power (your home's full-strength electricity supply), behind the switch or in the distribution board. That is the panel of circuit breakers, often called the fuse box.
AC that ignores your temperature or schedule
When the AC will not hold the temperature or schedule you set, first find out whether the fault is in the smart control or in the AC itself.
In many homes, the smart system talks to the AC through a gateway, a small box that translates between the two. If the gateway fails or loses its settings, the AC may keep running on its own wall controller and ignore the app.
Our guide to an AC not keeping the temperature or schedule you set helps you tell which side has the fault, so you call the right person.
- Schedules that run at the wrong time can come from a controller clock that reset after a power cut.
- If the AC works from its own wall controller but not from the app, the fault is more likely on the smart side.
- If the AC runs but never gets cold enough, the AC unit is more likely at fault.
- Some Dubai homes get their cooling from district cooling, where a central plant cools a whole area. Empower, one provider, ran 90 district cooling plants across Dubai at the end of 2025. If the problem is with that supply, your smart controls cannot fix it, so ask your building management first.
The whole system stops responding
If nothing answers the app, the fault is usually central. Check the hub or main controller, its power supply, your network and any cloud service (the maker's online server) the app depends on.
Check that the hub has power and its lights look normal, and that your router works. Think about whether anything changed on your network recently. Restarting the hub and router fixes some cases.
If a maker shuts down its cloud service, the app may stop working for good. This has happened. By 18 April 2022, owners of Insteon smart home products had found its cloud servers no longer worked.
A technician can sometimes move control to a newer hub that still talks to your existing switches. Our guide to a home automation system not responding shows how to find where the fault is.
When the original installer has gone
Many older systems were set up by a company that has since closed or stopped supporting them. That makes repairs harder, but not always impossible.
KNX is an open standard, so products from different makers can work together. Installers set it up with ETS (Engineering Tool Software), the KNX Association's programming tool, which works with KNX products from any maker. With the original ETS project file (the file that holds your system's settings), another qualified installer can usually read and change your system.
Single-brand systems with locked settings can be harder to take over. Read repairing a KNX system when the original installer has gone before you call anyone.
Keep any old paperwork, drawings, passwords or project files you can find. They can save a technician a lot of time.
What you can check, and what needs a technician
Some checks are safe for you to do. Anything that means opening a switch, a cabinet or the AC needs a qualified person.
- You can restart the hub and router, following the maker's steps.
- You can check the app for old timers, scenes and schedules.
- You can try a compatible bulb in a light that flickers.
- You can test the AC from its own wall controller.
- Call a technician if a switch or module is warm, buzzing or smells of burning. Turn off that circuit at the distribution board first.
- Call a technician if a whole room, a floor or the entire system stops at once.
- Call a technician for any repair behind a switch plate, in the distribution board or inside the AC.
- Call a technician if nobody has the passwords or project file for the system.
What to tell a technician
A clear description helps a technician arrive with the right parts. It also helps you get a fairer quote.
- The brand and age of the system, if you know them
- Which switches, rooms or devices are affected, and when it started
- Anything that changed recently, such as a new router, a power cut or building work
- Photos of the hub, the switch fronts and the cabinet labels
- Any paperwork, drawings or passwords from the first installer
Your next step
If a fault needs a technician, ask one of the three smart home repair companies we chose for a consultation. Tell them your system's brand first and ask whether they work on it. Ask whether the first visit has a charge. Share the details above, and ask them to check the whole system while they are there, not only the part that failed.