# Cerbo MK2 - v3.5x - Pylontech BMS no longer working - MPPT not working

**URL:** <https://community.victronenergy.com/t/cerbo-mk2-v3-5x-pylontech-bms-no-longer-working-mppt-not-working/11099>\
**Category:** Q&A and troubleshooting\
**Tags:** pylontech, cerbo\_gx, ess\
**Created:** [10 November 2024 13:12 UTC](https://community.victronenergy.com/t/cerbo-mk2-v3-5x-pylontech-bms-no-longer-working-mppt-not-working/11099 "2024-11-10T13:12:32Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Frederic](https://avatars.discourse-cdn.com/v4/letter/f/4491bb/32.png) [@Frederic](https://community.victronenergy.com/u/Frederic)\
**Post date:** [10 November 2024 13:12 UTC](https://community.victronenergy.com/t/cerbo-mk2-v3-5x-pylontech-bms-no-longer-working-mppt-not-working/11099/1 "2024-11-10T13:12:33Z")

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Error 67, before v3.5x everything was working fine.  
A reboot sometimes works.  
MPPT stops producing energy.

Not sure if it’s only on MK2, I also have some installations on Cerbo MK1 which don’t have this problem after the update to 3.5x

Cable (own crimped) is measured and tested good.  
Also tested with a Victron type A cable.

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**Author:** ![thatrickguy](https://avatars.discourse-cdn.com/v4/letter/t/f04885/32.png) [@thatrickguy](https://community.victronenergy.com/u/thatrickguy)\
**Post date:** [26 November 2024 02:40 UTC](https://community.victronenergy.com/t/cerbo-mk2-v3-5x-pylontech-bms-no-longer-working-mppt-not-working/11099/2 "2024-11-26T02:40:00Z")

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im not sure they have figured out a fix as yet as I keep getting the error no matter what i try. What i find annoying is that it isnt straight away, sometimes it will go an entire weekend then 8am monday morning the alarm goes off. Reset and it will go off again 5 minutes later.

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**Author:** ![guystewart](https://dub1.discourse-cdn.com/victron/user_avatar/community.victronenergy.com/guystewart/32/1_2.png) [@guystewart](https://community.victronenergy.com/u/guystewart)\
**Post date:** [11 January 2025 08:55 UTC](https://community.victronenergy.com/t/cerbo-mk2-v3-5x-pylontech-bms-no-longer-working-mppt-not-working/11099/3 "2025-01-11T08:55:08Z")

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Hi Both,  
Apologies for the hassles, please see here for the solution;

> [@3.50 / 3.51 : VE.CAN losing connectivity to VM-3P75CT (Grid & AC Loads Enphase)](https://community.victronenergy.com/t/3-50-3-51-ve-can-losing-connectivity-to-vm-3p75ct-grid-ac-loads-enphase/12126/11):
>
> We have released Venus OS v3.53 that fixes the Cerbo MK2 VE.Can port 2 issue for (almost) all systems that we analysed via VRM. The complete troubleshooting processs for this is: Check if VE.Can Port 1 is in use as well. Our VRM stats show that often its not. In case not, replug and reconfigure the GX to work on VE.Can 1 port instead. If both ports are needed, update to Venus OS v3.53 or later, which will in most cases fix the issue. Only if that doesn’t fix the issue, contact your dealer fo…

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**Author:** ![system](https://europe1.discourse-cdn.com/victron/original/1X/21a9a7b5db7c6339715f993568736a7053199995.png) [@system](https://community.victronenergy.com/u/system)\
**Post date:** [25 January 2025 08:56 UTC](https://community.victronenergy.com/t/cerbo-mk2-v3-5x-pylontech-bms-no-longer-working-mppt-not-working/11099/4 "2025-01-25T08:56:00Z")

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Closed on 25 January 2025 08:56 UTC

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