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Troubleshooting the Optical Network Terminator (ONT) | BT Business
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Troubleshooting the Optical Network Terminator (ONT)

Your Openreach Optical Network Terminator (ONT) which connects your premises to our network has a number of status lights. Its lights should all glow a steady green. If any light is flashing or switched off, select the option which describes its status:

Openreach ECI modem
Huawei modem

Power light is off (this is the right-hand status light)

PON and LOS lights both flashing

Relevant Port light is off

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