Is error W70 a fault or a warning?

W70 is a warning: the unit keeps running. Fix the underlying condition before it escalates.

W70

Voltronic ESS error W70

BMS requests battery charging

Warning — a protection warning — the ESS unit keeps running, but deal with the cause before it escalates.

Energy storage systemWarning

BMS requests battery charging — Warning code 70 flashing on the display: BMS requests battery charging..

Cause: Battery status must be charged after the communication between the inverter and battery is successful; code 70 shows to charge the battery.

Allow the inverter to charge the battery as requested by the BMS.

Source: ESS510-manual.pdf, p.71

What does error W70 mean on a Voltronic ESS?: W70 means: BMS requests battery charging. Battery status must be charged after the communication between the inverter and battery is successful; code 70 shows to charge the battery.
Is error W70 a fault or a warning?: W70 is a warning: the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error W70?: Allow the inverter to charge the battery as requested by the BMS.

Compiled from official Voltronic user manuals. Always consult your device manual and a qualified technician before performing repairs.