Discussion topic: ONT Fault
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Message posted on 09 Jan 2026 07:09 PM
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ONT Fault
Red fault light on ONT
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Message posted on 09 Jan 2026 07:12 PM - last edited: 09 Jan 2026 07:13 PM
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Re: ONT Fault
If you have an ONT box displaying a red light, see this further advice...
NOTE: I only provide help on the forum boards so Direct Messaging is switched off
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Sky customer since 2001
with:
Sky Q | Sky Broadband | Sky Talk | Sky Mobile(s)
Message posted on 09 Jan 2026 07:25 PM
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Re: ONT Fault
Thanks but I've done all of those steps by and still have a red fault light
Message posted on 09 Jan 2026 07:26 PM
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Re: ONT Fault
Have you checked the service checker?
NOTE: I only provide help on the forum boards so Direct Messaging is switched off
▫️
Sky customer since 2001
with:
Sky Q | Sky Broadband | Sky Talk | Sky Mobile(s)
Message posted on 09 Jan 2026 07:32 PM
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Re: ONT Fault
Yes, done everything, service checker says everything ok but on phone when they done a check it says there is a fault 🤷🏼
Message posted on 09 Jan 2026 07:45 PM - last edited: 09 Jan 2026 07:48 PM
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Re: ONT Fault
@Bribhoy7 It's time to change the FOUR rechargeable batteries in that BBU, that is all possibly wrong with it, see the link below for the video on how to change them!
BT Openreach Fibre ONT - How to replace Battery Backup Batteries for phone line
Message posted on 09 Jan 2026 08:00 PM
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Re: ONT Fault
Brill, thanks I will try that 👍🏻
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