# Purpose of the Cerbo relay 1 function, Alarm Relay?

**URL:** <https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020>\
**Category:** Q&A and troubleshooting\
**Tags:** gx\_device, vrm, cerbo\_gx\
**Created:** [27 February 2026 00:51 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020 "2026-02-27T00:51:21Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![emjay](https://avatars.discourse-cdn.com/v4/letter/e/a88e57/32.png) [@emjay](https://community.victronenergy.com/u/emjay)\
**Post date:** [27 February 2026 00:51 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020/1 "2026-02-27T00:51:21Z")

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HI All,

trying to understand the control logic of the Cerbo/Ekrano relay function called “Alarm Relay”.

Can relay 1 switch states based on VRM alarms?

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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:** [27 February 2026 05:23 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020/2 "2026-02-27T05:23:55Z")

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It is designed to work with alarms generated by the GX itself.

The main function described in the manual is to do with temperature.

> **[9.3. Temperature relay configuration - 9. Configuration](https://www.victronenergy.com/media/pg/Ekrano_GX/en/configuration.html#UUID-13541e5d-9a7f-8297-ab19-1d0bede57f8c)**
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> No results found

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<div class="post-metadata">

**Author:** ![emjay](https://avatars.discourse-cdn.com/v4/letter/e/a88e57/32.png) [@emjay](https://community.victronenergy.com/u/emjay)\
**Post date:** [27 February 2026 14:56 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020/3 "2026-02-27T14:56:26Z")

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Thank you! However, the link to section 9.3 only references setting Relay 1 to be controlled by the temperature function. I am trying to drive Relay 1 based on a VRM based alarm by enabling Alarm Relay. I have not been able to get Relay 1 to change states based on any alarms. Any idea what controls Relay 1 when selecting Alarm Relay?

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<div class="post-metadata">

**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:** [27 February 2026 15:19 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020/4 "2026-02-27T15:19:25Z")

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The VRM has push notifications. They are designed to work through the apps.

If you found a way to push those to the gx you might have luck. But it is not designed to work like that natively.

You will have to look more into node red, get the gx to generate the alarm and latch or unlatch the relay as needed.

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<div class="post-metadata">

**Author:** ![emjay](https://avatars.discourse-cdn.com/v4/letter/e/a88e57/32.png) [@emjay](https://community.victronenergy.com/u/emjay)\
**Post date:** [27 February 2026 16:27 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020/5 "2026-02-27T16:27:31Z")

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thank you for the prompt response! I will look into Node Red.

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<div class="post-metadata">

**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:** [17 March 2026 07:42 UTC](https://community.victronenergy.com/t/purpose-of-the-cerbo-relay-1-function-alarm-relay/54020/6 "2026-03-17T07:42:48Z")

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A post was split to a new topic: [Relay alarm state](https://community.victronenergy.com/t/relay-alarm-state/55027)