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
DC input polarity reverse fault — The DC input from the PV strings is connected with reversed polarity.
Cause: The plus and minus conductors of a PV string are swapped at the inverter's DC input, so the inverter sees reverse polarity.
How to fix it
Check the PV input polarity.
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 · +4 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+71
What it means
DC input polarity reverse fault — The inverter detected that a PV string is connected to the DC input with reversed polarity.
Cause: A PV string's plus and minus conductors are swapped at the DC input.
How to fix it
Check the PV input polarity and reconnect the string correctly.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.56 · 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
PV Input Polarity Reversed — DC_Inversed_Failure - the PV DC input is connected with reversed polarity.
Cause: The PV input positive and negative cables are connected in reverse.
How to fix it
Check the PV input polarity.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.48 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.49 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.49
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
PV Input Polarity Reversed — DC input polarity reverse fault - the PV DC input is connected with reversed polarity.
Cause: The PV input positive and negative cables are connected in reverse.
How to fix it
- 1Check the PV input polarity
- 2Seek help from us if it cannot go back to the normal state.
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-ESS
What it means
DC input polarity reverse fault
Cause: The PV (DC) input is connected with reversed polarity.
How to fix it
- 1Check the PV input polarity and correct the wiring.
- 2Seek help from Deye if the system cannot go back to the normal state.
Source: 002_Download_4e90fe7a.pdf, p.46
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
DC_Inversed_Failure — DC input polarity reverse fault.
Cause: The PV (DC) input is connected with reversed polarity.
How to fix it
- 1Check the PV input polarity and correct the wiring.
- 2Seek help from Deye if the system cannot go back to the normal state.
Source: 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 voltage — A battery cell voltage has risen above the BMS over-voltage protection threshold; the code is shown on the LCD and charging is stopped to protect the cell.
Cause: Cell voltage exceeded the protection limit during charging - typically the inverter/PCS charge voltage is set too high for the battery, or cell imbalance pushes one cell over the limit before the pack is full.
How to fix it
- 1Stop charging and let the battery rest until cell voltages fall back into range.
- 2Check that the inverter/PCS charge-voltage and lithium-protocol settings match the battery.
- 3If the code returns on every charge, contact Deye support.
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_SUM_OVER_VOLT_LEV_2 — Total battery (pack) voltage too high - level-2 protection (manual wording: 'the total pressure is too high').
Cause: Pack voltage exceeded the level-2 over-voltage limit - the PCS charge voltage is set too high for the battery bank, or charging failed to taper near full.
How to fix it
- 1Stop charging and correct the PCS charge-voltage settings for the battery configuration.
- 2If the fault does not clear after the voltage falls, contact Deye support.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.12