If you have ever been told your smart meter “has no signal” or “isn’t communicating”, the problem usually comes down to one of two things: HAN or WAN. Once you understand the difference, most smart meter signal problems become much easier to understand.

How Smart Meters Communicate — WAN vs HAN Explained Simply

If your smart meter has stopped sending readings, your in-home display has lost connection, or your supplier says the meter is “not communicating”, the first thing to understand is how the system is meant to work.

Smart meters do not rely on just one connection.

They use two different types of communication:

HAN — the connection inside your home
WAN — the connection back to your supplier

Once you know which one has failed, the rest of the problem usually becomes much clearer.

What is HAN?

HAN stands for Home Area Network.

This is the short-range wireless network inside your home.

It links together:

your electricity meter
your gas meter
your in-home display (IHD)

Think of HAN as the private smart meter network inside the property.

If the HAN is working properly:

your gas meter can talk to the electricity meter
your in-home display can show your usage
the smart meter devices inside the home stay connected to each other

What is WAN?

WAN stands for Wide Area Network.

This is the external communications path between your smart meter system and your supplier.

It works a bit like a mobile signal:

data leaves the smart meter system through the communications hub
it goes out over the wider network
it reaches your supplier so they can receive readings

If the WAN is not working properly:

your supplier may not receive readings
your meter may appear “offline” on supplier systems
your bills may become estimated
smart tariffs may not work properly

Why your meter can work in the house but not with your supplier

This is one of the most common points of confusion.

You can have:

HAN working + WAN not working

That means:

your in-home display still works
your gas and electricity meters may still talk to each other
but your supplier cannot see the readings properly

So a customer gets told:

“Your meter isn’t communicating.”

Even though everything looks fine inside the house.

That usually means the WAN side has failed, not the whole meter.

Why WAN problems happen

From real-world installations, WAN issues are often caused by things like:

meters installed in basements or cellars
thick stone or concrete walls blocking signal
external meter boxes in weak signal areas
distance from the nearest suitable network coverage
faulty communications hubs
failed firmware updates

In simple terms: if there is no usable WAN connection, the system cannot send data out of the property properly.

Why HAN problems happen

HAN issues are usually more local to the home setup.

Common causes include:

the gas meter being too far from the electricity meter
walls, floors or cupboards weakening the signal
the in-home display losing its pairing
commissioning not being completed properly at installation
the gas meter dropping off the network after other smart meter work

If the HAN fails, you are more likely to see problems like:

gas meter not connecting
in-home display lost connection
electricity working but gas not showing

Can you fix WAN issues yourself?

Usually, no.

Unlike your home Wi-Fi, WAN signal is not something you can normally fix yourself.

What you can do is help narrow the problem down.

For example:

check whether your in-home display is still working
check whether your supplier is receiving readings
check whether one fuel is affected more than the other

If the WAN side has failed, what usually needs to happen is:

a supplier check of the communications status
an engineer visit if remote fixes fail
possibly repositioning the communications hub using a fly lead
in some cases, communications hub replacement

Why engineers sometimes move the communications hub

You may hear about a fly lead being fitted.

This allows the communications hub to be moved slightly away from the meter position and into a spot with better signal.

That might mean:

higher on a wall
closer to an outside wall
away from metal obstructions
into a better signal path

Sometimes even a small move is enough to restore WAN signal.

The simple way to remember it

HAN = inside your home
WAN = outside connection to your supplier

Or even simpler:

HAN = devices talking to each other
WAN = supplier receiving the data

If WAN fails, your supplier is effectively blind to the meter.

Final thoughts

Most smart meter communication problems come down to signal and connectivity rather than the meter being physically broken.

Understanding the difference between WAN and HAN helps explain:

why your meter may not be sending readings
why your display can still work while the supplier sees nothing
why engineers sometimes need to move or replace communications equipment
why one fuel can fail while the other still appears fine

If you have been told your meter “isn’t communicating”, the next question should be:

Is it the HAN, the WAN, or both?

How Smart Meters Communicate (WAN vs HAN Explained Simply)