Bluetooth is how you reach a charger when it has no network — during commissioning, or when a device has dropped offline. If pairing fails, there is usually a specific reason rather than a fault.
Pairing switches itself off. On current charger firmware, Bluetooth pairing is disabled one hour after the charger is powered up, and it stays disabled through ordinary power cycles. This is deliberate — an installed charger should not be permanently open to pairing.
Re-enabling pairing
Power-cycle the charger three times in a row. Each time, the charger must be on for less than 10 seconds before you switch it off again.
Leave it off for at least 3 seconds between cycles, and keep it on for at least 3 seconds as well. Flicking the breaker back and forth quickly does not register as three cycles.
A single power cycle will not re-enable pairing, however long you wait.
Once pairing is re-enabled you have about an hour to pair, as long as the charger is not restarted in the meantime. If it is restarted, run the three short power cycles again.
Other things that stop a connection
The phone holds a stale pairing. Remove the charger from the phone's Bluetooth settings and try again. Restarting the phone, or switching its Bluetooth off and on, clears most of these.
The charger is paired to another phone. A charger pairs to one phone at a time. If a different phone needs to connect, repeat the pairing process on that phone.
You are too far away, or there is metal in between. A charger inside a metal enclosure or behind a panel has a short usable range.
The app is out of date. Check the version under the profile icon and update if needed.
What you can and cannot do over Bluetooth
Bluetooth is for reaching and configuring the device — network settings, connectivity, device settings. It is not a charging control channel, and there is nothing available over Bluetooth that cannot also be changed from the web portal when the device is online.
For the connection procedure itself, see Connect to the charger via Bluetooth. For the LMC, Bluetooth is activated by pressing the button on the device for at least a second — the connectivity LED turns blue.
If it still will not pair
Send us the charger serial number, the firmware version if you can see it, your phone model and operating system version, and confirmation that you tried the three short power cycles. If the device is otherwise online we can often check and change the setting you need remotely, which avoids the pairing problem entirely.