Learn why the Hoymiles DTU-Pro-S shows a 'Missing Microinverter' error after firmware updates and how to fix it.
The Missing Microinverter error can occur due to firmware incompatibility or communication issues between the DTU and microinverters.
To resolve this issue, ensure that the firmware is up to date and check the connections between the DTU and microinverters.
The DTU-Pro-S acts as a communication gateway between the microinverters and the monitoring platform. If it reports a 'Missing Microinverter' fault, it typically indicates that the DTU-Pro-S cannot detect one or more microinverters due to communication failures or configuration issues. This can stem from firmware incompatibility, where the updated firmware does not support the existing microinverters, or incorrect settings that prevent proper identification. Furthermore, electrical parameters such as RISO (Insulation Resistance) measurements can trigger ground fault detection mechanisms, resulting in the inverter shutting down to protect the system and prevent safety hazards.
After a firmware update, users may observe a 'Missing Microinverter' alert on the Hoymiles monitoring app. The DTU-Pro-S may show LED indicators flashing in a specific pattern to indicate communication errors. Additionally, energy production may drop significantly, often reflecting zero output from the affected microinverters.
Always consult a licensed electrician or certified solar installer when troubleshooting electrical components to ensure safety and compliance with applicable codes.