Pylontech BMS Connection Lost - firmware OS 3.51

Q&A and troubleshooting New UI
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UPDATED 2025-01-10 - due to Venus OS v3.53 release which fixes this issue in most cases.

On a systems having this issue:

  1. 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.
  2. If both ports are needed, update to Venus OS v3.53 or later (announcement), which will in most cases fix the issue.
  3. Only if that doesn’t fix the issue, contact your dealer for further troubleshooting and if necessary replace that Cerbo MK2 (under warranty). Venus OS v3.53 fixes the VE.Can port 2 issue for most Cerbo MK2s, but we’ve seen some of them where there really is a hardware issue and RMA is the only solution.
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