If your smart meter has stopped sending readings and you have been told the communications hub has failed, the fault is usually with the smart meter communications equipment — not the meter recording your usage itself. This guide explains what the communications hub does, why it fails, and what your supplier should do next.

Communications Hub Failed — What Happens Next?

If an engineer or supplier has told you the communications hub has failed, that usually means the smart side of your metering system has broken down.

Your meter may still be recording usage locally, but without a working comms hub the data cannot flow properly. That is when automatic readings stop, the in-home display may stop updating, and bills can start drifting onto estimates.

The good news: a failed communications hub is your supplier’s problem to deal with, not yours.

What is the communications hub?

The communications hub is the part of the smart meter system that manages the wireless connections.

It handles:

the WAN — the Wide Area Network connection between the smart meter system and your supplier
the HAN — the Home Area Network connection linking the electricity meter, gas meter and in-home display inside your home

Without a working communications hub, the smart meter system goes effectively quiet.

That means:

your supplier may stop receiving automatic readings
your in-home display may stop updating properly
your gas meter may drop out of smart mode
your bills may become estimated

On many installations the communications hub is a separate box attached to or near the electricity meter. On others it is more integrated into the setup. It usually has status lights, including the WAN light, to show what is going on.

Why do communications hubs fail?

There are a few common reasons.

1. Failed or corrupted firmware update

Communications hubs receive remote firmware updates. If an update fails or becomes corrupted, the hub can enter a fault state that does not recover cleanly.

This is one of the more common real-world reasons for hub failure, especially where the hub had been working for a long time before suddenly failing.

2. Network or technology upgrade issues

As parts of the smart meter communications infrastructure evolve, some older hub types can become less suitable and may need replacing.

That is not something the customer has caused. It is part of the wider smart meter system and supplier equipment lifecycle.

3. Hardware fault

Like any electronic device, communications hubs can develop faults over time. Some hubs are now years into service, so plain hardware failure is a real possibility.

4. Physical environment problems

In some cases damp, exposed locations, persistent signal problems or local interference can contribute to the hub failing or becoming unstable.

Can you fix it yourself?

Usually, no.

A failed communications hub is not normally something you can repair by pressing buttons, resetting the meter or unplugging equipment.

If the hub has entered a genuine fault state, the fix usually requires supplier action and often an engineer visit.

Important: this is not your fault and it is not something you should be expected to pay to repair yourself.

Who is responsible for replacing it?

Your energy supplier is responsible for dealing with failed smart metering equipment, including the communications hub.

You should not be told to pay for the hub replacement yourself.

This matters because some customers get fobbed off or made to feel like the equipment failure is somehow their responsibility. It is not. The communications hub is part of the supplier-managed smart metering system.

What happens during an engineer visit?

If the supplier sends an engineer to replace a failed communications hub, they will usually:

remove or isolate the faulty hub
fit a replacement hub
re-establish the smart meter connection
re-pair the gas meter and in-home display where needed
check that readings are flowing properly before leaving

In many cases, the visit is straightforward.

But do not assume the problem is fixed just because somebody attended. Commissioning and pairing problems can still happen after the physical replacement, so check the outcome properly.

After the visit, ask:

can the supplier now see readings remotely?
is the gas meter paired and smart again?
is the in-home display updating?
has the engineer fully completed commissioning?

What should your supplier do once you report the fault?

Once you formally report a smart meter operational problem, the supplier should not just log it and leave the case drifting.

Under Ofgem’s live smart meter rules, suppliers should carry out an initial assessment, take action that helps identify the issue, and offer written confirmation of what they found and what they did within 5 working days. [oai_citation:0‡Ofgem .pdf](sediment://file_00000000c2b47243b7ec4fc645bcef30)

Important: that does not mean the full hub replacement must always be completed within 5 working days. It means the supplier should start properly investigating the issue and communicating what it is doing. [oai_citation:1‡Ofgem .pdf](sediment://file_00000000c2b47243b7ec4fc645bcef30)

When you contact them, you could say:

“My smart meter is not sending readings and I have been told the communications hub has failed. Please confirm what assessment has been completed, what action has been taken so far, and what the next step is to restore smart functionality.”

It is still sensible to ask for a complaint or case reference number, because that helps you prove when the issue was reported.

How long should you wait?

You should not be left indefinitely on vague promises.

If the supplier keeps delaying, keeps trying the same failed remote actions, or cannot explain what is happening, put it in writing and treat it as a formal complaint.

If the case is still unresolved after 8 weeks — or if you receive a deadlock letter sooner — you can usually escalate to the Energy Ombudsman.