Smart Meter Signal Problems? (WAN & HAN Issues Explained + Fixes)
Quick answer: If your smart meter has no signal, is flashing WAN lights, or not sending readings, it’s usually a communication problem — not a faulty meter. This guide explains what’s actually going on and what you should do next.
Common signs: Your smart meter not sending readings, WAN light flashing, gas meter not connecting, in-home display not updating, or app showing old data.
What’s actually going on
Your smart meter has two main connections:
- WAN (Wide Area Network): This connects your meter to your energy supplier.
- HAN (Home Area Network): This connects your electricity meter, gas meter, and in-home display (IHD).
If either of these fail, things start to go wrong — even if the meter looks like it’s still working.
In most cases, your meter is still recording usage correctly. The problem is the data isn’t getting where it needs to go.
Common signs of a signal problem
- WAN light flashing (especially red or every second)
- Smart meter not sending readings
- Energy bills showing as estimated
- Gas meter not connecting
- IHD working but supplier can’t see your usage
- Smart meter stopped working after switching supplier
If you’re seeing one or more of these, you’re likely dealing with a signal or communication issue.
Common signal problems explained
WAN light flashing
This usually means your meter is struggling to connect to the wider network.
👉 Read: WAN light flashing explained
WAN light flashing red
This often points to a more serious communication issue or failed connection.
👉 Read: WAN light flashing red – what it means
WAN flashing every second (comms hub in distress)
This can indicate a comms hub fault or failed update — often requires replacement.
No signal / weak signal
This is common in certain areas and property types.
👉 Read: Why your smart meter has no signal
Why signal problems happen
- Rural or northern areas with weak network coverage
- Thick walls, basements, or meter cupboards blocking signal
- Metal meter boxes acting like a Faraday cage
- New build properties with insulation issues
- Old comms hubs (especially non-4G models)
👉 Why signal problems are common in northern areas
👉 Why signal problems happen in old and new homes
What actually fixes it
There’s no quick reset or button press that fixes signal issues.
In most cases, it comes down to:
- Engineer visit to diagnose properly
- Comms hub upgrade (often to 4G)
- Relocating the comms hub using a fly lead
- Replacing faulty equipment
👉 What is a smart meter fly lead?
👉 Why moving the comms hub can fix signal issues
Related smart meter problems
- Smart meter not sending readings
- Smart meter not commissioned properly
- Why is my energy bill estimated?
- Gas meter not connecting to smart meter
- Smart meter display (IHD) not working
What to do next
If your smart meter has signal problems, don’t ignore it.
The longer it’s left, the more likely you are to:
- Build up estimated bills
- Miss out on smart tariffs
- Lose visibility of your usage
Contact your supplier and clearly explain:
“My smart meter has a signal / WAN communication issue and is not sending readings.”
If it’s been ongoing, you may also be entitled to compensation depending on how long it takes to fix.