What does error 40 mean on a DEYE inverter?

It depends on the model — 8 devices use code 40. On the SUN G01P3-EU-BM8 Series it means: DC over current. The card for each model on this page gives its exact meaning and fix.

DEYE inverter error 40 (F040)

DC over current

Also displayed as F040 / F40 on some models.

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

The exact meaning depends on your model:

SUN G01P3-EU-BM8 Series

InverterFault

Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8SUN-7K-G02P1-EU-AM2SUN-7.5K-G02P1-EU-AM2SUN-8K-G02P1-EU-AM2+3

What it means

DC over current — The DC input current exceeded the over-current protection limit. The manual notes this code has hardly ever appeared in the field.

Cause: The DC input current exceeded the over-current protection limit.

How to fix it

Restart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code.

Source: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.63 · 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.52 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.52

SUN G03/G01P3-AM8 Series

InverterFault

Also applies to:SUN-60K-G03SUN-70K-G03SUN-75K-G03SUN-80K-G03SUN-90K-G03SUN-100K-G03SUN-110K-G03SUN-60K-G01P3-EU-AM8-LV+7

What it means

DC over current — The DC input current exceeded the over-current protection limit.

Cause: The DC input current exceeded the over-current protection limit.

How to fix it

Restart the inverter; if the fault is not ruled out, contact the installer or the manufacturer's customer service.

Source: 033_BManual_SUN-70_75_80_90_100_110K-G03_20260702_en_a9db1e1b.pdf, p.63 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.62 · 060_BManual_SUN-60_70_75K-G01P3-EU-AM8-LV_20260701_en_f559aeec.pdf, p.62 · +1 more official manuals

SUN G04/G05/G06 3-Phase

InverterFault

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

DC over current — The DC input current exceeded the protection limit.

Cause: PV input current above the DC over-current protection threshold.

How to fix it

Restart the inverter; if the fault is not ruled out, contact the installer or manufacturer customer service.

Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.58

SUN G04P1/G05P1 Series

InverterFault

Also applies to:SUN-1K-G04P1-EU-AM1SUN-1.5K-G04P1-EU-AM1SUN-2K-G04P1-EU-AM1SUN-2.2K-G04P1-EU-AM1SUN-2.5K-G04P1-EU-AM1SUN-2.7K-G04P1-EU-AM1SUN-3K-G04P1-EU-AM1SUN-3.3K-G04P1-EU-AM1+36

What it means

DC over current — The DC input current exceeded the protection limit.

Cause: PV input current above the DC over-current protection threshold.

How to fix it

Deye states this code has hardly ever appeared in the field; contact your installer or Deye service if it occurs.

Source: 031_BManual_SUN-1_1.5_2_2.2_2.5_2.7_3_3.3_3.6_4K-G04P1-EU-AM1_20260624_en_15adc00c.pdf, p.54 · 036_BManual_SUN-3_4_5_6_7_8_9_10_12_15K-G06P3-EU-BM2_20250506_en_0eb78440.pdf, p.58

SUN SG01HP3/SG02HP3 Hybrid

InverterFault

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

Internal DC Overcurrent — INT_DC_OverCurr_Fault - inverter internal DC overcurrent.

Cause: The inverter's internal DC current exceeded the limit.

How to fix it

Restart the inverter.

Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.51 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.52 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.52

GB-A HV Battery

BatteryFault

Also applies to:GB-A

What it means

ALARM_ID_CURRENT_MODULE_FAULT — Current module fault.

Cause: The current-measurement module (shunt/Hall sensor module) failed its self-check.

How to fix it

Restart the system.
If the fault persists, contact Deye support for module replacement.

Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.14

Frequently asked questions

What does error 40 mean on a DEYE inverter?: It depends on the model — 8 devices use code 40. On the SUN G01P3-EU-BM8 Series it means: DC over current. The card for each model on this page gives its exact meaning and fix.
Is error 40 a fault or a warning?: 40 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
How do I clear or fix error 40?: Restart the inverter; if the code persists after the restart, contact your installer or Deye service and provide the inverter serial number, the installation date and the displayed error code. The exact steps for each affected model are listed on this page.

Related error codes

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

SUN G01P3-EU-BM8 Series

What it means

How to fix it

SUN G03/G01P3-AM8 Series

What it means

How to fix it

SUN G04/G05/G06 3-Phase

What it means

How to fix it

SUN G04P1/G05P1 Series

What it means

How to fix it

SUN SG01HP3/SG02HP3 Hybrid

What it means

How to fix it

GB-A HV Battery

What it means

How to fix it

Frequently asked questions

Related error codes

Other codes on the SUN G01P3-EU-BM8 Series

Other codes on the SUN G03/G01P3-AM8 Series

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

Other codes on the SUN G04P1/G05P1 Series

Other codes on the SUN SG01HP3/SG02HP3 Hybrid

Other codes on the GB-A HV Battery