17-48 Melfield Gardens

27/02/2025, 16:12

What do the lights on the Openreach modem mean? | BT Help

Openreach fibre modem is on.

Green

Check PON and LOS status below.

POWER (right-hand light)

Openreach fibre modem is off.

Off

Check the mains plug is in.

Fibre optic link to BT exchange is working and recognises your Openreach fibre modem.

Check physical connection at both ends of the cable between the Openreach fibre modem and Hub. Try new cable if needed.

PON solid green

PON flashing and LOS off

Openreach fibre modem is communicating with BT exchange for verification.

Wait until light turns solid green.

PON and LOS (left hand lights)

Check that the thin white fibre optic cable coming into your Openreach fibre modem is inserted and not damaged. Turn the Openreach fibre modem's power off, then back on and wait five minutes for the Openreach fibre modem to attempt to reconnect.

Fibre optic link is not connected or there's a problem between your property and the BT exchange.

PON off, or PON and LOS both flashing

Ethernet connection is normal between Openreach fibre modem and Hub (Port 1 is where engineer will install).

There may be a connection problem - check your Hub.

On (any)

PORT1 PORT4

Blinking (any)

Data is being transmitted through the port.

There may be a connection problem - check your Hub.

Check physical connection at both ends of the cable. Try new cable if needed.

Ethernet cable to Hub is not inserted or broken.

Off (all)

https://www.bt.com/help/landline/lights-on-the-openreach-modem

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