Sometimes a simple "reset" works. Remove the key and re-insert it firmly, ensuring it is the right way around. Some SSE-branded meters may require this step specifically to refresh the emergency credit screen.
Sometimes the meter needs a specific sequence to reset the switch.
Here’s a clear, helpful review/explanation of the code on an electric meter, written as if for a customer FAQ or troubleshooting guide: error d2 on electric meter
If the key was recently topped up but the meter won't accept it, the key might be corrupted or blocked. Try checking your receipt for a "Credit Failed" message; if it appears, you must take the key back to the PayPoint, Payzone, or Post Office where you topped up.
: Ensure the meter and its surroundings are free from damage or conditions that could interfere with its operation. Sometimes a simple "reset" works
: In some cases, it might signify an internal fault or malfunction within the meter itself, which could be related to the hardware or firmware.
: On some meters, like the AC9000 KEd, D2 may point specifically to a problem reading the key card due to dust or damage. How to Fix Error D2 Sometimes the meter needs a specific sequence to
On most modern electricity meters (particularly smart meters and key-card prepayment meters),
: The most common reason is that there isn't enough credit on the key to clear a debt or pull the meter out of "emergency credit" mode.