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 insulation impedance failure — The PV-array-to-ground insulation impedance is too low.
Cause: The insulation impedance between the PV array and ground is too low: often a PV panel problem, poor grounding of the PV panel frames or of the inverter, or an AC/DC cable or terminal block shorted to ground or with damaged insulation.
How to fix it
- 1Check the Vpe resistance on the main board and its detection on the control board, and check that the PV panels are OK - many times this issue is a PV problem
- 2Check that the PV panel aluminium frames and the inverter are grounded well; open the inverter cover and check that the inside ground cable is fixed well on the shell
- 3Check whether an AC/DC cable or terminal block is shorted to ground or has damaged insulation
- 4Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.62 · 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.51 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.51
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 insulation impedance failure — The PV-array-to-ground insulation impedance is too low.
Cause: The insulation impedance between the PV array and ground is too low: often a PV panel problem, poor grounding of the PV panel frames or of the inverter, or an AC/DC cable or terminal block shorted to ground or with damaged insulation.
How to fix it
- 1Check the Vpe resistance on the main board and its detection on the control board, and check that the PV panels are OK - many times this issue is a PV problem
- 2Check that the PV panel aluminium frames and the inverter are grounded well; open the inverter cover and check that the inside ground cable is fixed well on the shell
- 3Check whether an AC/DC cable or terminal block is shorted to ground or has damaged insulation
- 4Restart the inverter; if the fault still exists, contact your installer.
Source: 033_BManual_SUN-70_75_80_90_100_110K-G03_20260702_en_a9db1e1b.pdf, p.62 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.61 · 060_BManual_SUN-60_70_75K-G01P3-EU-AM8-LV_20260701_en_f559aeec.pdf, p.61 · +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+71
What it means
DC insulation impedance failure — PV-to-ground insulation resistance measured below the protection limit.
Cause: Very often a PV-side problem: PV panel frames or the inverter not grounded well, the internal ground cable not fixed well on the shell, AC/DC cables or terminal blocks shorted to ground, or damaged insulation; it can also be the Vpe resistance on the main board or its detection on the control board.
How to fix it
- 1Check the Vpe resistance on the main board and its detection on the control board; check the PV panels (many times this is a PV problem); check that the panel frames and the inverter are grounded well and the inside ground cable is fixed well on the shell; check the AC/DC cables and terminal blocks for shorts to ground or damaged insulation.
- 2Restart the inverter; if the fault still exists, contact your installer or Deye service.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.57 · 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.53 · 036_BManual_SUN-3_4_5_6_7_8_9_10_12_15K-G06P3-EU-BM2_20250506_en_0eb78440.pdf, p.57
Also applies to:SUN-3.6K-SG05LP1-EU-SM2-PSUN-5K-SG05LP1-EU-SM2-PSUN-6K-SG05LP1-EU-SM2-PSUN-7K-SG05LP1-EU-SM2-PSUN-7.6K-SG05LP1-EU-SM2-PSUN-8K-SG05LP1-EU-SM2-PSUN-10K-SG05LP1-EU-SM2-PSUN-7.6K-SG01LP1-EU+21
What it means
DC insulation impedance failure — PV isolation resistance is too low.
Cause: The PV panels are not firmly and correctly connected to the inverter, or the PE cable of the inverter is not connected to ground, so the measured PV insulation resistance is too low.
How to fix it
- 1Check that the connection of PV panels and inverter is firm and correct, and check whether the PE cable of the inverter is connected to ground.
- 2Seek help from Deye if the inverter cannot go back to the normal state.
Source: 039_BManual_SUN-3.6_5_6_7_7.6_8_10K-SG05LP1-EU-SM2-P_20260428_en_70c401a6.pdf, p.50 · 043_BManual_SUN-12_14_16K-SG01LP1-EU_20260519_en_703e15ac.pdf, p.46 · 052_BManual_SUN-_3.6-6_K-OG01LP1-EU-AM2_20260406_en_dc31b173.pdf, p.45 · +4 more official manuals
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 Insulation Resistance Too Low — DC_Insulation_Fault - the PV isolation resistance is too low.
Cause: The insulation resistance between the PV array and ground is below the limit; the PV panel connections or the inverter's PE grounding may be faulty.
How to fix it
- 1Check that the connection of the PV panels and the inverter is firm and correct
- 2Check whether the PE cable of the inverter is connected to ground.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.50 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.51 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.51
Also applies to:SUN-5K-SG02LP2-US-AM2SUN-6K-SG02LP2-US-AM2SUN-7.6K-SG02LP2-US-AM2SUN-8K-SG02LP2-US-AM2SUN-10K-SG02LP2-US-AM3SUN-12K-SG02LP2-US-AM3
What it means
DC Insulation Impedance Failure — DC insulation impedance failure - the PV isolation resistance is too low.
Cause: The insulation resistance between the PV array and ground is below the limit; the PV panel connections or the inverter's PE grounding may be faulty.
How to fix it
- 1Check that the connection of the PV panels and the inverter is firm and correct
- 2Check whether the PE cable of the inverter is connected to ground
- 3Seek help from us if it cannot go back to the normal state.
Source: 059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf, p.54
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 Insulation Failure — DC insulation failure - the PV isolation resistance is too low.
Cause: The insulation resistance between the PV array and ground is below the limit; the PV panel connections or the inverter's PE grounding may be faulty.
How to fix it
- 1Check that the connection of the PV panels and the inverter is firm and correct
- 2Check whether the PE cable of the inverter is connected to ground
- 3Seek 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.46 · 040_BManual_SUN-3_4_5_6_8_10_12K-SG05LP3-EU-SM2_20260319_en_b0183b7d.pdf, p.46 · 044_BManual_SUN-14_15_16_18_20K-SG05LP3-EU-SM2_20260319_en_ac7cdbd1.pdf, p.46
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 insulation failure — PV isolation resistance is too low.
Cause: The PV array's insulation resistance to ground is below the limit - damp or damaged PV wiring, or the inverter PE cable is not properly grounded.
How to fix it
- 1Check that the PV panel connections to the inverter are firm and correct and that the inverter's PE cable is connected to ground.
- 2Seek help from Deye if it does not recover.
Source: 002_Download_4e90fe7a.pdf, p.47
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_Insulation_Fault — PV isolation resistance is too low.
Cause: The PV array's insulation resistance to ground is below the limit - damp or damaged PV wiring, or the inverter PE cable is not properly grounded.
How to fix it
- 1Check that the PV panel connections to the inverter are firm and correct and that the inverter's PE cable is connected to ground.
- 2Seek help from Deye if it does not recover.
Source: 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.50 · 010_Download_cc05df18.pdf, p.45
Also applies to:SE-F5SE-F5 PlusSE-F5 ProSE-F12SE-F12-CSE-F12-ESE-F12-LSE-F16+3
What it means
AFE-SCDL/SCD — Hardware short-circuit discharge protection (SCD) from the BMS analog front end tripped.
Cause: The analog front-end chip detected a short-circuit-level discharge current at the battery terminals.
How to fix it
- 1Disconnect the DC cables, find and clear the short circuit, then restart the battery.
- 2If it trips with nothing connected, contact Deye support.
Source: 023_deye_ess_user_manual_se_f12_euende_v05_20250925_1_74c6be2d.pdf, p.12 · 024_Download_96dc9a42.pdf, p.12 · 025_deye_ess_user_manual_se_f5_euen_v09_20250926_4ded9303.pdf, p.14 · +2 more official manuals
Also applies to:GB-A
What it means
ALARM_ID_ULTIMATE_PROTECTION — Ultimate protection.
Cause: A critical parameter passed the final protection threshold, beyond the normal recoverable protection levels.
How to fix it
- 1Switch the battery off and disconnect it; do not keep operating it.
- 2Contact Deye support before returning it to service.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.13