EV charging

EV charger app connection lost

Warning Do not attempt any electrical or gas work yourself. Always use a qualified, MCS-certified, or Gas Safe registered professional for repairs.

What you’re seeing (symptoms)

You open your charging app (e.g. Ohme, Wallbox, Myenergi) and it shows your charger as “Offline,” “Disconnected,” or displays data that is several hours old. You cannot start or stop a charge or change your schedule remotely.

What’s normal vs not normal

Normal:

  • A brief (1-2 minute) loss of connection when your home router reboots.
  • The app being slow to update during peak hours (e.g. 10pm when many people start their charge).

Not normal:

  • The charger remaining offline for more than 24 hours.
  • The charger physically showing a “connected” light but the app saying it’s offline.
  • The app asking you to re-pair the charger every time you use it.

Likely causes (ranked)

  1. Weak Wi-Fi signal: The charger is outside and the Wi-Fi router is too far away, leading to an unstable connection.
  2. Server downtime: The manufacturer’s cloud server is temporarily down for maintenance.
  3. Router settings: A recent router update or a change in Wi-Fi password has disconnected the charger.
  4. 4G/GSM signal failure: If your charger uses a built-in SIM card, it may be in a “dead zone” or the internal antenna has come loose.
  5. Firmware mismatch: Your phone app is updated but the charger’s internal software is out of date.

Quick checks you can do safely

  • Check your phone: Ensure your phone has a working internet connection (Wi-Fi or 4G).
  • Power cycle the router: Turn your home Wi-Fi router off and on again.
  • Reboot the charger: Switch the charger off at the main fuse/breaker for 30 seconds, then switch it back on.
  • Check the status lights: Look at the LEDs on the charger. Most units have a specific “Wi-Fi” or “Cloud” light (often blue or green).
  • Check the manufacturer’s social media: See if other users are reporting server outages.

When to call an installer

  • If the charger remains offline after a full power cycle and a router reboot.
  • If you have changed your Wi-Fi and cannot access the charger’s “Setup Mode” to enter the new password.
  • If you suspect the internal Wi-Fi/GSM module has failed.

Questions to ask your installer

  • “Can you install a Wi-Fi extender or a hardwired ethernet cable to improve the connection?”
  • “Is the signal strength (RSSI) high enough at the charger’s location?”
  • “Does the charger require a specific port to be opened on my router’s firewall?”

Related NetZeroNow tools & guides

FAQs

Can I still charge my car? Usually, yes. Most chargers will default to a “Plug and Charge” mode if they lose internet. This means it will charge at full power as soon as you plug in, but you won’t be able to use off-peak schedules. How do I update the Wi-Fi? Most chargers have a “Hotspot Mode.” You usually hold a button on the unit until a light flashes, then connect your phone to the charger’s own Wi-Fi to enter your home credentials. Why does it use a SIM card? Some chargers (like Ohme) use the 4G mobile network instead of your Wi-Fi. This is more reliable but can fail if the signal in your area is weak. Do I need a Wi-Fi extender? If your charger is more than 10 metres from your router or behind thick brick walls, a Wi-Fi extender or a “Powerline” adapter is highly recommended. Is my data safe? Yes. Charging apps only transmit data about your charging sessions and schedules. They do not have access to your home network’s private files.\n

Written by NetZeroNow | Last updated on 2026-03-02