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
GFDI blown fuse — The GFDI protection fuse has blown. The manual notes this code has hardly ever appeared in the field.
Cause: The ground-fault detector/interrupter fuse has blown, which points to a ground-fault current having flowed on the PV side.
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.61 · 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.50 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.50
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
GFDI blown fuse — The GFDI protection fuse has blown.
Cause: The ground-fault detector/interrupter fuse has blown, which points to a ground-fault current having flowed on the PV side.
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.60 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.60 · 060_BManual_SUN-60_70_75K-G01P3-EU-AM8-LV_20260701_en_f559aeec.pdf, p.60 · +1 more official manuals
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
GFDI blown fuse — The fuse of the ground-fault detector/interrupter (GFDI) circuit has blown.
Cause: A ground-fault current large enough to blow the GFDI protection fuse has passed, or the fuse circuit itself failed.
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.56
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
GFDI blown fuse — The fuse of the ground-fault detector/interrupter (GFDI) circuit has blown.
Cause: A ground-fault current large enough to blow the GFDI protection fuse has passed, or the fuse circuit itself failed.
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.52 · 036_BManual_SUN-3_4_5_6_7_8_9_10_12_15K-G06P3-EU-BM2_20250506_en_0eb78440.pdf, p.56
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
DC/DC Converter 1 Start Failure — DCDC1_START_Failure - the BUS voltage cannot be reached by PV or battery.
Cause: DC/DC converter 1 failed to start because the internal BUS voltage could not be built up from the PV or battery input.
How to fix it
Switch off the DC switches and restart the inverter.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.49 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.50 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.50
Also applies to:SUN-5K-SG04LP3-EUSUN-6K-SG04LP3-EUSUN-8K-SG04LP3-EUSUN-10K-SG04LP3-EUSUN-12K-SG04LP3-EUSUN-3K-SG05LP3-EU-SM2SUN-4K-SG05LP3-EU-SM2SUN-5K-SG05LP3-EU-SM2+9
What it means
DC Start Failure — DC_START_Failure - the BUS voltage cannot be built from PV or battery.
Cause: The internal BUS voltage could not be built up from the PV or battery input.
How to fix it
- 1Restart the inverter.
- 2If the fault still exists, contact us for help.
Source: 038_BManual_SUN-5_6_8_10_12K-SG04LP3-EU_20260319_en_081932c1.pdf, p.45 · 040_BManual_SUN-3_4_5_6_8_10_12K-SG05LP3-EU-SM2_20260319_en_b0183b7d.pdf, p.45 · 044_BManual_SUN-14_15_16_18_20K-SG05LP3-EU-SM2_20260319_en_ac7cdbd1.pdf, p.45
Energy storage systemFault Also applies to:AI-W5.1-5P3-EU-B-ESSAI-W5.1-6P3-EU-B-ESSAI-W5.1-8P3-EU-B-ESSAI-W5.1-10P3-EU-B-ESSAI-W5.1-12P3-EU-B-ESSGB-SL5K-EUGB-SL6K-EUGB-SL8K-EU+11
What it means
DC_START_Failure — DC start failure - the internal BUS voltage cannot be built up.
Cause: Neither PV nor battery could establish the internal BUS voltage at start-up - insufficient input voltage or a start-up circuit fault.
How to fix it
- 1Restart the inverter.
- 2If the fault still exists, contact Deye for help.
Source: 002_Download_4e90fe7a.pdf, p.46 · 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.49 · 010_Download_cc05df18.pdf, p.44
Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7
What it means
Cell over temperature — Cell temperature rose above the protection limit; charge/discharge is stopped until the pack cools.
Cause: Sustained high charge/discharge current, high ambient temperature, or poor ventilation around the battery drove the cell temperature above its limit.
How to fix it
- 1Stop charging/discharging and let the battery cool.
- 2Improve ventilation and keep the battery within its rated operating temperature range.
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
Also applies to:GB-A
What it means
ALARM_ID_OVER_DIFF_VOLT_LEV_2 — Excessive voltage differences between cells/modules (manual wording: 'excessive pressure differences').
Cause: The voltage gap between the highest and lowest cell or module exceeded the level-2 threshold - cell imbalance from aging, long storage, or a weak module.
How to fix it
- 1Charge the bank fully at low current so the BMS can balance the cells.
- 2If the difference does not close after several full charges, contact Deye support.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.12