If your smart meter has stopped sending readings, has a flashing WAN light, or lost smart functions after switching supplier — this is your starting point. Everything you need to understand what’s happening and what to do next.
How Smart Meter Communication Works
Your smart meter relies on two separate connections to work properly:
- WAN (Wide Area Network) — connects your meter to your energy supplier and the national smart meter network
- HAN (Home Area Network) — connects your electricity meter, gas meter and in-home display to each other inside your home
When either connection fails, your meter may still record your energy use — but the data stops getting where it needs to go. That leads to estimated bills, missing readings and lost smart functions.
In most cases your meter is not broken. It is a communication problem. And your supplier is responsible for fixing it.
Common Signs of a Signal Problem
- WAN light flashing, red or flashing every second
- Smart meter not sending readings automatically
- Energy bills showing as estimated despite having a smart meter
- Gas meter not connecting to electricity meter
- In-home display not updating or showing old data
- Smart functions stopped working after switching supplier
- Supplier saying they cannot see your meter readings
WAN Issues — Wide Area Network Problems
WAN problems affect the connection between your meter and your supplier. These are the most common signal issues and usually require an engineer visit or comms hub upgrade to fix.
- WAN light flashing — what it means and what to do
- WAN light flashing red — what it means and what to do
- WAN flashing every second — comms hub in distress
- Smart meter has no signal — causes and fixes
- Smart meter not sending readings to your supplier
HAN Issues — Home Area Network Problems
HAN problems affect the connection between devices inside your home — usually between your electricity meter, gas meter and in-home display.
- WAN and HAN explained — what they are and why they matter
- Gas meter not connecting to smart meter
- In-home display not working or not updating
Communications Hub Problems
The communications hub is the device that manages both your WAN and HAN connections. Many older hubs are being upgraded to 4G — but until that happens, signal problems persist.
- What is a smart meter fly lead — and why engineers use one
- Why moving the comms hub can fix a signal problem
Signal Problems After Switching Supplier
Losing smart functions after switching is one of the most common smart meter problems in the UK. It is nearly always a commissioning failure — your new supplier has not properly taken over your meter.
- Smart meter not commissioned properly — what it means
- Supplier can read your meter but cannot activate smart tariffs
Why Signal Problems Happen
- Why signal problems are more common in northern areas
- Why signal problems happen in both old and new homes
What Actually Fixes a Signal Problem
There is no reset button or quick fix for most smart meter signal problems. In the majority of cases, a fix requires one of the following:
- An engineer visit to diagnose the fault properly
- A comms hub upgrade — often to a 4G model
- Relocation of the comms hub using a fly lead
- Recommissioning the meter by your supplier
Your supplier is responsible for arranging this. Under Ofgem’s rules they must provide a resolution plan within 5 working days of you reporting the fault.
Your Rights If Your Supplier Won’t Fix It
Most people don’t know they have legal rights the moment they report a smart meter signal problem.
Under Ofgem’s Guaranteed Standards of Performance — live from 23 February 2026:
- Your supplier must provide a resolution plan within 5 working days of you reporting a fault
- If they fail to do this — you are owed £40 automatic compensation
- If compensation is not paid within 10 working days — it doubles to £80
- If your problem is not resolved within 8 weeks — you can escalate to the Energy Ombudsman free of charge
→ Your full rights under Ofgem’s 2026 rules
→ How the Energy Ombudsman works
Not Sure What’s Causing Your Problem?
Answer a few quick questions and we’ll identify what’s wrong and what to do next.
→ Run the free Smart Meter Health Check
Ready to Complain?
If you’ve already reported the problem and your supplier isn’t responding — generate a formal complaint letter in minutes. It cites the correct Ofgem regulation automatically.
→ Generate your complaint letter — free
Written by a qualified UK smart meter installer. Independent advice — not affiliated with any energy supplier. smartmeterhelp.co.uk