Is error W15 a fault or a warning?

W15 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 W15?

Contact an after-sales engineer to send the command that fixes the version error. The exact steps for each affected model are listed on this page.

W15

DEYE inverter error W15

Prefix error

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

It means the same on every affected model — find yours for the exact fix:

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

Prefix error — A firmware version (prefix) error occurred during upgrade.

Cause: A version error occurred during a firmware upgrade, leaving the inverter with a mismatched firmware version prefix.

How to fix it

Contact an after-sales engineer to send the command that fixes the version error.

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

Prefix error — Firmware version/prefix error after an upgrade.

Cause: A version upgrade error corrupted the firmware version (prefix) data.

How to fix it

Contact the after-sales engineer to send a command to fix it.

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

Frequently asked questions

What does error W15 mean on a DEYE inverter?: W15 means: Prefix error. A version error occurred during a firmware upgrade, leaving the inverter with a mismatched firmware version prefix.
Is error W15 a fault or a warning?: W15 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 W15?: Contact an after-sales engineer to send the command that fixes the version error. 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

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.