# Multiplus 2: flashing "mains on"

**URL:** <https://community.victronenergy.com/t/multiplus-2-flashing-mains-on/60931>\
**Category:** DIY\
**Tags:** multiplus-ii, diy\
**Created:** [26 July 2026 19:31 UTC](https://community.victronenergy.com/t/multiplus-2-flashing-mains-on/60931 "2026-07-26T19:31:58Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![hans66](https://avatars.discourse-cdn.com/v4/letter/h/bbe5ce/32.png) [@hans66](https://community.victronenergy.com/u/hans66)\
**Post date:** [26 July 2026 19:31 UTC](https://community.victronenergy.com/t/multiplus-2-flashing-mains-on/60931/1 "2026-07-26T19:31:59Z")

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Hi

I have a Multiplus 2, with LiFePO4 battery in ESS mode.

Nothing connected to AC out (yet).

All works fine and according to expectations. - AFAIK.

One “issue”. The “mains on” led is flashing often but not always.

I read in the manuals that “The device rejects the mains supply or is still synchronising.”

I have checked the mains voltage (~ 230V); Frequency is ~ 50Hz; Grid code is EN50549 (Europe) - I am located in the Netherlands.

Question: is this a real issue? What can I do about it?

Thanks, Hans

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**Author:** ![dognose](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/dognose/32/968_2.png) [@dognose](https://community.victronenergy.com/u/dognose)\
**Post date:** [26 July 2026 19:54 UTC](https://community.victronenergy.com/t/multiplus-2-flashing-mains-on/60931/2 "2026-07-26T19:54:54Z")

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> [@hans66](#):
>
> Question: is this a real issue? What can I do about it?

No. Probably have to read on 😛 : if Mains & Inverter is flashing synchronous (And Bulk solid orange), that just means “energy feedin to ACIN during ESS Mode” 🙂

The Victron Toolkit app has a interactive section for that 🙂

 ![image](https://europe1.discourse-cdn.com/victron/original/3X/0/6/069950b610be4e74efb64bcc844740c3d542e67b.jpeg)

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**Author:** ![lxonline](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/lxonline/32/25567_2.png) [@lxonline](https://community.victronenergy.com/u/lxonline)\
**Post date:** [26 July 2026 20:48 UTC](https://community.victronenergy.com/t/multiplus-2-flashing-mains-on/60931/3 "2026-07-26T20:48:24Z")

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> [@hans66](#):
>
> Question: is this a real issue? What can I do about it?

No issue if the GX is not reporting any error.

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**Author:** ![hans66](https://avatars.discourse-cdn.com/v4/letter/h/bbe5ce/32.png) [@hans66](https://community.victronenergy.com/u/hans66)\
**Post date:** [27 July 2026 12:18 UTC](https://community.victronenergy.com/t/multiplus-2-flashing-mains-on/60931/4 "2026-07-27T12:18:37Z")

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Thanks…I did look for the answer, but I got always pointed to the AC Sync issues. Thanks again.