What does error W04 mean on a Voltronic inverter?

It depends on the model — 37 devices use code W04. On the Axpert MAX II TWIN it means: Low battery. The card for each model on this page gives its exact meaning and fix.

Is error W04 a fault or a warning?

W04 is a warning: the red LED flashes and the unit keeps running. Fix the underlying condition before it escalates.

How do I clear or fix error W04?

The unit keeps operating. Clear the condition shown and the warning resets automatically; if it persists, contact your installer or the repair centre. The exact steps for each affected model are listed on this page.

W04

Voltronic inverter error W04

Low battery

Warning — the red LED flashes and the inverter keeps running. Deal with it before it escalates.

The exact meaning depends on your model:

Axpert MAX II TWIN

InverterWarning

Also applies to:Axpert MAX II TWIN 8KWAxpert MAX II TWIN 11KWAxpert MAX II TWIN 12KWAxpert MAX II Duplex 8KWAxpert MAX II Duplex 11KWAxpert MAX II 8KWAxpert MAX II 11KWAxpert MAX 8K TWIN PV11K+46

What it means

Low battery

Cause: Low battery.

How to fix it

The unit keeps operating.
Clear the condition shown and the warning resets automatically; if it persists, contact your installer or the repair centre.

Source: Axpert-MAXII-8K-TWIN-Off-grid-manual.pdf, p.48 · Axpert-MAXII-11K-TWIN-Off-grid-manual.pdf, p.48 · Axpert-MAXII-8K-Duplex-Off-grid-manual.pdf, p.45 · +27 more official manuals

InfiniSolar WP LV 12KW Premium

InverterWarning

Also applies to:InfiniSolar 10KWInfiniSolar 15KWInfiniSolar Super 4KWInfiniSolar Plus 5KW

What it means

Line frequency low loss — Warning code 04 flashing on the display: Line frequency low loss.

Cause: Grid frequency is too low.

How to fix it

The unit keeps operating.
Clear the condition shown and the warning resets automatically; if it persists, contact your installer or the repair centre.

Source: InfiniSolar-WP-LV-12KW-Premium-manual.pdf, p.51 · InfiniSolar-10KW-manual-20191126.pdf, p.49 · InfiniSolar-15K-manual-20200313.pdf, p.50 · +2 more official manuals

InfiniSolar E 5.5KW

InverterWarning

What it means

Battery low — Warning code 04 flashing on the display: Battery low.

Cause: Battery low.

How to fix it

Restart the unit again.
If problem still exists, please contact your installer.
Recharge or replace the battery Try to reduce the applied load Re-connect the battery Check the ventilation around the unit Try to reduce the load Check if fans run normally.

Source: InfiniSolarE-5.5KW-manual.pdf, p.45

InfiniSolar TX-PA 30KW

InverterWarning

What it means

LineFreqHLoss — Warning code 04 flashing on the display: LineFreqHLoss.

Cause: Grid frequency is too high.

How to fix it

The unit keeps operating.
Clear the condition shown and the warning resets automatically; if it persists, contact your installer or the repair centre.

Source: InfiniSolar-TX-PA_manual.pdf, p.49

ESS510

Energy storage systemWarning

What it means

Battery low — Warning code 04 flashing on the display: Battery low..

Cause: Battery low.

How to fix it

Recharge or replace the battery.

Source: ESS510-manual.pdf, p.71

Giant Elite 3P/3P

upsWarning

Also applies to:Giant Elite 3P/3P 10K-40KVA

What it means

battery voltage low — Warning code 04 flashing on the display: battery voltage low.

Cause: battery voltage low.

How to fix it

The unit keeps operating.
Clear the condition shown and the warning resets automatically; if it persists, contact your installer or the repair centre.

Source: Giant-Elite-3P3P-manual.pdf, p.41

Frequently asked questions

What does error W04 mean on a Voltronic inverter?: It depends on the model — 37 devices use code W04. On the Axpert MAX II TWIN it means: Low battery. The card for each model on this page gives its exact meaning and fix.
Is error W04 a fault or a warning?: W04 is a warning: the red LED flashes and the unit keeps running. Fix the underlying condition before it escalates.
How do I clear or fix error W04?: The unit keeps operating. Clear the condition shown and the warning resets automatically; if it persists, contact your installer or the repair centre. The exact steps for each affected model are listed on this page.

Related error codes

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

Axpert MAX II TWIN

What it means

How to fix it

InfiniSolar WP LV 12KW Premium

What it means

How to fix it

InfiniSolar E 5.5KW

What it means

How to fix it

InfiniSolar TX-PA 30KW

What it means

How to fix it

ESS510

What it means

How to fix it

Giant Elite 3P/3P

What it means

How to fix it

Frequently asked questions

Related error codes

Other codes on the Axpert MAX II TWIN

Other codes on the InfiniSolar WP LV 12KW Premium

Other codes on the InfiniSolar E 5.5KW

Other codes on the InfiniSolar TX-PA 30KW

Other codes on the ESS510

Other codes on the Giant Elite 3P/3P