57Fault

DEYE inverter error 57 (F57)

AC reverse irrigation

Also displayed as F57 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+18

What it means

AC reverse irrigation — Reverse power flow into the AC grid was detected ('AC reverse irrigation', i.e. reverse feed-in).

Cause: Power is flowing back into the AC grid beyond what the configuration allows, so the inverter flags reverse feed-in (the manual's remedy column simply restates 'AC reverse irrigation').

How to fix it

If export to the grid is not intended, check the zero-export/limiter settings and the meter or sensor-clamp installation; restart the inverter and contact your installer if the fault persists.

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 · +4 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+71

What it means

AC reverse irrigation — Reverse power flow ('reverse irrigation') detected on the AC side.

Cause: AC current flowed backwards into the inverter (reverse power flow on the AC side).

How to fix it

The manual gives no remedy beyond identifying AC reverse power flow; contact your installer or Deye service if the fault persists.

Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.59 · 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.59

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 2 Voltage Low — BAT2_VoltLow_Fault - the terminal voltage of battery input 2 is too low.

Cause: The voltage measured at the battery 2 terminals is below the limit.

How to fix it

  1. Check whether the battery 2 terminal voltage is low
  2. Restart the inverter 2 times and restore the factory settings.

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

GB-SL / GB-SL Pro ESS

Energy storage systemFault

Also applies to:GB-SL5K-EUGB-SL6K-EUGB-SL8K-EUGB-SL10K-EUGB-SL12K-EUGB-SL15K-EUGB-SL20K-EUGB-SL Pro 5K-EU+6

What it means

BAT2_VoltLow_Fault — Battery 2 terminal voltage is too low.

Cause: The voltage measured at the battery 2 terminals is below the limit - the battery is over-discharged or the settings are wrong.

How to fix it

  1. Check the battery 2 terminal voltage, restart the inverter twice and restore the factory settings.
  2. Seek help from Deye if it does not recover.

Source: 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.51 · 010_Download_cc05df18.pdf, p.46

Frequently asked questions

What does error 57 mean on a DEYE inverter?
It depends on the model — 8 devices use code 57. On the SUN G01P3-EU-BM8 Series it means: AC reverse irrigation. The card for each model on this page gives its exact meaning and fix.
Is error 57 a fault or a warning?
57 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 57?
If export to the grid is not intended, check the zero-export/limiter settings and the meter or sensor-clamp installation; restart the inverter and contact your installer if the fault persists. 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 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 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 GB-SL / GB-SL Pro ESS

All GB-SL / GB-SL Pro ESS 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.