Why has my smart meter stopped sending readings?
A smart meter that has quietly gone offline still measures correctly but stops telling anyone, and the first symptom is usually an estimated bill months later. How to spot it and what to ask for.
- Difficulty
- beginner
- Time
- 20 min
- Read
- 5 min
- Safety
- caution
Short answer
Check your online account for the date of the last actual reading — if it is more than a couple of months old, or bills are marked estimated, the communications link has dropped. The meter is still recording your usage accurately, so nothing is lost, but you should submit manual readings in the meantime so the estimates do not build into a catch-up bill.
A smart meter has two separate jobs: measuring, which it does in the meter itself, and communicating, which it does over a national network built for the purpose. The second fails far more often than people realise, because it depends on signal at the meter's location — often a cupboard, a cellar or an outside box on a thick wall. When it fails, nothing visible happens. The meter keeps measuring correctly, the supplier starts estimating, and the first sign is usually a bill months later that does not match reality. The good news is that no data is lost: the readings are still there in the meter and can be recovered when it reconnects or when someone reads it manually.
Safety
Step by step
- Check when the last actual reading was.Log into your energy account and look at the bill or usage history. Readings are usually marked as actual, customer or estimated. A run of estimated readings is the diagnosis.
- Check whether the in-home display still shows live data.The display talks to the meter over a short-range link, and that is separate from the meter's link to the wider network. A display showing live usage while the supplier gets nothing tells you the meter is fine and the wide-area communications have dropped.
- Start submitting manual readings now.This is the important step, because it stops estimates accumulating. Read the meter yourself and submit through the app or account monthly. A smart meter can always be read manually — usually by pressing the button on the front to cycle through the registers.
- Report it to your supplier.They can see the connection status from their side, and they may be able to re-establish it remotely. Ask them explicitly to log a communications fault, and note the reference.
- Ask about the underlying cause.Common reasons are poor signal at the meter location, a first-generation meter that lost functionality after a supplier switch, or a failed communications hub. The distinction matters because they have different remedies.
- Ask about the first-generation meter issue specifically.Early smart meters lost their smart functionality when the customer switched supplier, which affected a large number of households. A programme has been upgrading these remotely over the national network, so it is worth asking whether yours is scheduled.
- Push for a visit if it does not resolve.If remote attempts fail, the fix is an engineer visit to check or replace the communications hub or aerial. There should be no charge for repairing a fault with the supplier's own equipment.
- Watch the bill when it reconnects.When communications resume, the stored readings usually come across and the account is corrected in one go, which can look alarming. It is a correction rather than a new charge, and the catalogue's guide on a large catch-up bill covers what to do if it is unaffordable.
Common mistakes
- Assuming a smart meter means you never need to read it — A meter with no communications quietly generates estimates for months. Checking the account once a quarter for the words actual or estimated takes seconds.
- Ignoring estimated bills because they look low — Low estimates are debt accumulating. The correction arrives eventually and it arrives all at once, usually in winter when it is least welcome.
If it doesn't work
Display works but the supplier only has estimates
Cause: Wide-area communications lost, short-range link fine — Fix: Report it as a communications fault and submit manual readings in the meantime. This is the most common version of the problem.
Display blank and supplier has estimates
Cause: Could be the display, the hub, or the meter — Fix: Try the display on mains power near the meter first to rule it out, then report it. A blank display alone does not mean the meter has failed.
Started right after switching supplier
Cause: First-generation meter losing smart functionality on a switch — Fix: Ask the new supplier explicitly whether your meter is a first-generation SMETS1 device and whether it is scheduled for enrolment onto the national network. Meanwhile submit manual readings.
Meter in a cellar, cupboard or outside box with no signal
Cause: Location — Fix: An engineer can sometimes fit an external aerial. If not, the meter operates in manual mode and you should submit readings, which is inconvenient but perfectly workable.
Large corrected bill after reconnection
Cause: Accumulated real usage replacing low estimates — Fix: You owe for energy you used, but you can ask for time to pay, and back-billing rules limit how far back a supplier can charge for energy it failed to bill for. The catalogue's guide on a catch-up bill covers this.
Prepayment smart meter losing connection
Cause: Same communications problem, higher stakes — Fix: Report it urgently. A prepayment meter that cannot receive top-ups remotely is a supply risk, and suppliers must treat it as a priority — ask about the Priority Services Register if anyone in the household is vulnerable.
Questions people ask
Have I lost the usage data?
No. The meter records and stores your consumption regardless of whether it can communicate. When the link is restored, or when a manual reading is taken, everything reconciles.
Can I be charged for a supplier's failure to bill me?
Back-billing rules prevent suppliers charging for energy used more than twelve months previously where they were at fault for not billing accurately. That does not wipe recent usage, but it caps the exposure — raise it explicitly if a very large historical bill appears.
Is it worth having the meter replaced?
If the fault is the communications hub, replacing that is the normal fix and is not a whole-meter job. If your property simply has no usable signal, a replacement will not help, and manual readings are the practical answer.