If your smart meter WAN light is flashing, you’re not alone. This is one of the most common issues across the UK — and one of the most misunderstood.
The key thing is this:
Not all flashing WAN lights mean the same thing.
Some can be fixed. Others mean the comms hub is finished.
🔧 What is the WAN light?
The WAN (Wide Area Network) light shows whether your smart meter is communicating with the network outside your home.
This is how your readings get sent to your energy supplier.
If the WAN isn’t working properly:
- Your readings won’t send
- Your bills may be estimated
- Smart tariffs may stop working
🔴 WAN Light Flashing Red – What It Means
If your WAN light is flashing red, this usually points to a comms hub fault.
In many real-world cases, this is caused by:
- Failed firmware updates
- Internal hub faults
- Hardware failure
In simple terms:
👉 The hub is not communicating — and often not recoverable.
What this means for you:
- Your meter will not send readings
- Smart features won’t work
- The issue usually cannot be fixed remotely
Typical outcome:
👉 The comms hub needs replaced.
⚡ WAN Flashing Every Second – What It Means
If your WAN light is flashing every second, this usually means:
The hub is trying to connect — but cannot get a stable signal.
This is a signal or communication issue, not necessarily a hardware failure.
Common causes include:
- Weak WAN signal in your area
- Meter location (cellar, cupboard, metal box)
- Incorrect hub type (e.g. 420 vs 4G)
- Signal blocked by building materials or insulation
The important difference:
👉 This type of issue is often fixable.
Typical fixes include:
- Upgrading to a 4G comms hub
- Repositioning the hub
- Using a fly lead (external aerial)
🧠 The Simple Way to Think About It
- 🔴 Flashing red → Hub fault (likely replacement)
- ⚡ Flashing every second → Signal issue (often fixable)
Or put simply:
👉 One can be fixed. The other goes in the wheelie bin.
🪖 What Should You Do Next?
If you’re seeing WAN issues:
- Contact your energy supplier
- Explain exactly what the WAN light is doing
- Ask if a hub replacement or upgrade is required
If your issue has been ongoing:
- You may be entitled to compensation
👉 Check compensation rules here
🔗 Related Smart Meter Problems
👉 Smart meter not sending readings
👉 Smart meter signal & connectivity problems
🧠 Final Thought
Many people assume their smart meter is working because it’s installed — but behind the scenes, communication issues like this are very common.
Understanding what the WAN light is telling you can save weeks or even months of frustration.