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SMETS1 Secure Liberty 100/110 smart meter guide for WAN, HAN, lights and buttons: DIY tutorial series

  • 14 September 2020
  • 1 reply
SMETS1 Secure Liberty 100/110 smart meter guide for WAN, HAN, lights and buttons: DIY tutorial series
Userlevel 7

Updated on 14/09/20: If your SMETS1 smart meter has an issue, diagnose it here. If your SMETS1 Pipet IHD has an issue, diagnose it here or for a SMETS1 Chameleon IHD, here


SMETS1 Secure smart meters - your guide


This guide is about S1 Secure Liberty 100/110 smart meters. For information about how S2 meters communicate, please see this guide 


What's good about smart meters? 

  • The meter will automatically submit your meter readings to us - this means bills will be accurate, rather than estimated
  • You’ll be able to see how much energy different appliances use, which could help you to cut down what you’re spending
  • Efficiency is the main reason why it is a government initiative to install them - their aim is to have at least 80% of households to have Smart meters by 2020.
  • Your smart meter is secure, with codes of practice regulated by Ofgem – and all your personal data is safeguarded by the Data Protection Act.
  • Installation is free.


What do the buttons on the keypad do?

1 - Displays cost of consumption and units used on the current day and previous day
2 - Displays cost of consumption in the current week and previous week
3 - Displays cost of consumption in the current month and previous month
4 - Displays historical data comprising monthly units consumed and cost of consumption
- Displays ‘Not Used’
- Displays tariff name, standing charge per day, active rate register(s) along with the consumption and cost per unit recorded in each rate register (Will provide Eco-7 readings: IMP R01 is the night read - reg 0 on SFE, and IMP R02 is the day read - reg 1 on SFE)
7 - Displays ‘Not Used’
8 - Displays ‘Not Used’
9 - Displays total import and export register values (will provide a total reading after IMP KWH)
0 - Performs display check and then displays date, time, load and CO2 data of the current hour and current day, yesterday, last week and last month (will show 'COMMISSION' instead if meter needs to be comissioned)

- Used for prepayment customers - Switches the display to UTRN(vend) entry mode; serves as backspace key during UTRN(vend) entry; enables Emergency Credit when made available; initiates supply reconnection from ‘READY' state. (Activates vend mode/Used to start reconnection process.)
B - Activates auto scroll display from sleep mode; used to scroll back through a display sequence; initiates UTRN(vend) authentication process; mutes alarm; used to confirm supply reconnection from ‘READY’ state.

Activating 'Boost' functionality on Liberty 110/112 meters

If you are’re economy 7 customer with a Secure Liberty 110/112 (5-port) meter  and youwould like to activate the appliance that is connected to their fifth terminal during peak hours, you can do so using the smart meter keypad.

You can activate this either on the IHD or the meter up to 10 times a day and will turn on anything attached to the 5th terminal for 1 hour, this will be charged at the peak unit rate.

To activate the boost function:

  • Via the meter, press '2' on the keypad and press the 'A' button to activate - you'll hear a click when the boost has been activated and your meter display will read 'BOOST ON'
  • Via the IHD, press 'Dual Fuel' and then tap on the 'Status' button at the bottom of the screen on the electric side of the display - see the S1 Pipet guide here, and the S1 Chameleon guide here


WAN and HAN:

  • An issue with WAN will affect the ability of the electricity meter (and gas meter, if present) to send us data
  • An issue with HAN will not affect the ability of the meter to send us electricity data, but will affect the gas meter and IHD

What is WAN (Wide Area Network)?


WAN allows an electricity smart meter to send/receive data (such as meter readings) securely through the S1 Communications Hub. It uses a roaming SIM that works on 2.5G to do this - the same kind of data network your mobile phone uses. If you have good 4G signal but no 2.5G in your area, the meter will have no WAN.

What is an S1 Communications Hub?

The communications hub attached to the smart electricity meter is effectively our smart kit's brain. It works a little bit like a mobile phone, using a sim card to allow data to be received and transferred from the smart meters to OVO.

The hub allows for information to be stored, such as your meter readings and energy consumption history. This information is then relayed to the correct meter and will also be reflected through your IHD.

There are two main communication channels used by the hub; WAN (Wide Area Network) and HAN (Home Area Network).

How does WAN work?

Using the sim card installed in the S1 Communications Hub, the member's electricity smart meter will search for the strongest mobile data network in the area. (We call this roaming as the meter is able to pick and choose it's network depending on strength, unlike most mobile phones.)

  • If the electricity smart meter is able to latch onto a network, WAN will be established. This will allow for data to be transferred to between the smart meter(s) and OVO.
  • If a connection is unable to be established, it will be known in the industry, as a 'no-WAN'.

What do we mean by 'no-WAN'?

If there's 'no WAN', your electricity smart meter can’t connect to a network. This means no data can be transferred between the smart meter(s) and OVO.

  • This will mean you will need to provide your meter readings manually. 
  • However, providing your IHD is within the HAN, the IHD will continue to display your consumption as normal.

What do we mean by intermittent WAN?

If the mobile phone network(s) in a your area is weak, the WAN connection may drop in and out. This is known as 'intermittent WAN'. In such instances, you will need to wait for your electricity smart meter to establish a WAN connection again. We recommend providing manual meter readings in the meantime.

I think I have an issue with their WAN... What can I do?

If you believe you have an issue with your WAN, go through the smart meter health check. From this we will be able to identify:

  • If you have WAN and how strong this signal is
  • If the meter has been commissioned and has the ability to communicate with us
  • If a master reset may be able to resolve the issue

What is the HAN (Home Area Network)?


The HAN is a secure network that works in the same way as other wireless systems in the home. It allows the smart electricity meter to communicate with the smart gas meter IHD and Smart Relay (remember: gas meters can’t send us readings on their own or send data to the IHD).

A smart electricity meter uses the HAN to collect the readings/data from the gas meter. It also uses HAN to send information to the IHD and to connect to the Smart Relay. HAN only works if the gas meter and/or IHD is within range.

What do we mean by 'no-HAN'?

If there’s ‘no HAN’ - the gas smart meter and/or IHD, can’t communicate with the electricity smart meter. This affects:

  • Gas meter - If the smart gas meter has 'no-HAN', it can’t send the meter readings/data back to the electricity meter. In this instance, you would need to provide a manual meter reading.
  • IHD - If the IHD is out of range from the HAN, it can’t display any data from the smart meters.

​​​How do you identify if a device is connected to the HAN?

Gas meters

  • In the bottom right-hand corner of the gas smart meter screen, there is a HAN symbol. The symbol will be flashing or solid:
    • Flashing - This would suggest that the meter is not connected to HAN. In this case, please complete the smart meter health check.
    • Solid - This is confirmation that the gas meter has been secured to the HAN. However it does not necessarily indicate that we are able to communicate with the gas meter. 


  • You will need to check the Wifi symbol on the IHD:
    • For Pipet IHDs, see the guide linked here
    • For Chameleon IHDs see the guide linked here


The metrology light


If your supply is off and you’re unsure if this a meter fault or power cut, the metrology light is a good indicator. If off supply and:

  • Metrology light is flashing - power is going through meter indicating a fault with member's appliances. This means the member should contact an electrician.
  • Metrology light is solid - power is stuck at the meter and not passing through indicating a fault with the meter. This means we should book an EMEX.
  • Metrology light is off - power is not entering the meter indicating a fault with the incoming supply. This means their may be a power cut or issue with DNO equipment, therefore the member should check with neighbours and potentially contact DNO.


That’s your guide to SMETS1 WAN and HAN - leave a comment if we’ve missed anything out!

1 reply

Userlevel 4

Much awaited guide Tim - thank you!

A concise, easy to read and can help with some basic understanding of SMETS1.

As I am still waiting for my IHD, I can try to understand use/spend information using the buttons in the interim.