W03Warning

DEYE inverter error W03

Arc warning

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

The exact meaning depends on your model:

SUN G01P3-EU-BM8 Series

InverterWarning

Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8SUN-60K-G03SUN-70K-G03SUN-75K-G03+12

What it means

Arc warning — An arc issue was detected on the PV side of the inverter.

Cause: An electrical arc has formed on the PV side, usually at a poor or loose PV string connection.

How to fix it

Check the connection of the PV, then clear the fault through the ARC function in the operating parameters; the inverter can then resume operation.

Source: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.60 · 033_BManual_SUN-70_75_80_90_100_110K-G03_20260702_en_a9db1e1b.pdf, p.59 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.59 · +2 more official manuals

SUN G04/G05/G06 3-Phase

InverterWarning

Also applies to:SUN-6K-G06-LV-P1SUN-8K-G06-LV-P1SUN-6K-G06P3-EU-BM2-LV-P1SUN-8K-G06P3-EU-BM2-LV-P1SUN-10K-G05-LVSUN-12K-G05-LVSUN-15K-G05-LVSUN-15K-G06P3-EU-BM2-P1+27

What it means

Arc warning — Warning that the PV side of the inverter has caused an arc issue.

Cause: An arc was detected on the PV side of the inverter, usually from a loose or poor PV connection.

How to fix it

Check the connection of the PV, then clear this fault through the ARC function in the operating parameters; the inverter can then resume operation.

Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.56

SUN SG01HP3/SG02HP3 Hybrid

InverterWarning

Also applies to:SUN-5K-SG01HP3-EU-AM2SUN-6K-SG01HP3-EU-AM2SUN-8K-SG01HP3-EU-AM2SUN-10K-SG01HP3-EU-AM2SUN-12K-SG01HP3-EU-AM2SUN-15K-SG01HP3-EU-AM2SUN-20K-SG01HP3-EU-AM2SUN-25K-SG01HP3-EU-AM2+9

What it means

Grid Phase Warning — Grid_phase_warn - the phase sequence detected at the grid connection is abnormal.

Cause: The phase sequence connection of the power grid is incorrect, or the configured grid type does not match the actual grid.

How to fix it

  1. Check the phase sequence connection of the power grid
  2. Try to change the grid type (e.g. 240/120)
  3. If there is still no solution, check the wiring at the grid end.

Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.48 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.49 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.49

Frequently asked questions

What does error W03 mean on a DEYE inverter?
It depends on the model — 4 devices use code W03. On the SUN G01P3-EU-BM8 Series it means: Arc warning. The card for each model on this page gives its exact meaning and fix.
Is error W03 a fault or a warning?
W03 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 W03?
Check the connection of the PV, then clear the fault through the ARC function in the operating parameters; the inverter can then resume operation. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the SUN G01P3-EU-BM8 Series

All SUN G01P3-EU-BM8 Series codes All SUN G03/G01P3-AM8 Series codes

Other codes on the SUN G04/G05/G06 3-Phase

All SUN G04/G05/G06 3-Phase codes

Other codes on the SUN SG01HP3/SG02HP3 Hybrid

All SUN SG01HP3/SG02HP3 Hybrid codes

Prefer the full written guide? Read the complete DEYE inverter error-code guide

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