51Fault

DEYE inverter error 51 (F051)

W phase grid current DC component over current

Also displayed as F051 / F51 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

W phase grid current DC component over current — The DC component of the W-phase grid current is too high. The manual notes this code has hardly ever appeared in the field.

Cause: The DC component of the W-phase grid current exceeds the allowed 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.53 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.53

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

W phase grid current DC component over current — The DC component of the W-phase grid current is too high.

Cause: The DC component of the W-phase grid current exceeds the allowed 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

W phase grid current DC component over current — The DC component of the W-phase grid current is too high.

Cause: The DC component injected in the W-phase output current exceeded its limit.

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

W phase grid current DC component over current — The DC component of the W-phase grid current is too high.

Cause: The DC component injected in the W-phase output current exceeded its limit.

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.55 · 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

Battery Temperature High — Battery_Temp_High_Fault - the battery temperature is too high.

Cause: The battery temperature reported by the BMS is too high.

How to fix it

Check whether the temperature data of the BMS is too high.

Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.52 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.53 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.53

RW Spring Series Battery

BatteryFault

Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7

What it means

Charge inverses — Charging current was detected flowing in the wrong direction.

Cause: Reversed DC cable polarity or a miswired charge source pushed current through the battery in the reverse direction.

How to fix it

Switch off immediately and verify the polarity of the DC cables between battery and inverter before reconnecting.

Source: 093_Deye_RW-L2.5A_User_Manual_EN_89188fb8.pdf, p.10 · 019_Download_4a609b7e.pdf, p.10 · 021_Download_f81ba1e7.pdf, p.10 · +6 more official manuals

GB-A HV Battery

BatteryFault

Also applies to:GB-A

What it means

ALARM_ID_BMU_NTC_BREAKLINE_ERROR — The temperature collection of the BMU connector is abnormal (NTC open circuit).

Cause: The NTC temperature sensor line on a BMU connector is broken or disconnected.

How to fix it

  1. Restart the system.
  2. If the fault persists, contact Deye support for service.

Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.14

Frequently asked questions

What does error 51 mean on a DEYE inverter?
It depends on the model — 10 devices use code 51. On the SUN G01P3-EU-BM8 Series it means: W phase grid current DC component over current. The card for each model on this page gives its exact meaning and fix.
Is error 51 a fault or a warning?
51 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 51?
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

Other codes on the SUN G01P3-EU-BM8 Series

All SUN G01P3-EU-BM8 Series codes All SUN G02P1-EU Series codes

Other codes on the SUN G03/G01P3-AM8 Series

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 G04P1/G05P1 Series

All SUN G04P1/G05P1 Series codes All SUN G06P3-EU Series codes

Other codes on the SUN SG01HP3/SG02HP3 Hybrid

All SUN SG01HP3/SG02HP3 Hybrid codes

Other codes on the RW Spring Series Battery

All RW Spring Series Battery codes All SE Spring Series Battery 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.