Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8
What it means
The DC busbar is unbalanced — The voltages on the two halves of the DC bus are unbalanced.
Cause: The DC bus half-voltages are unbalanced; the 'BUSN' cable or the driver-board power supply cable may be loose.
How to fix it
- 1Check whether the 'BUSN' cable or the driver-board power supply cable is loose
- 2Restart 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
Also applies to:SUN-7K-G02P1-EU-AM2SUN-7.5K-G02P1-EU-AM2SUN-8K-G02P1-EU-AM2SUN-9K-G02P1-EU-AM2SUN-10K-G02P1-EU-AM2SUN-10.5K-G02P1-EU-AM2
What it means
The DC busbar is unbalanced — The voltages on the two halves of the DC bus are unbalanced. The manual notes this code has hardly ever appeared in the field.
Cause: The voltages on the two halves of the DC bus drifted apart beyond the allowed unbalance.
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: 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
The DC busbar is unbalanced — The voltages on the two halves of the DC bus are unbalanced.
Cause: The DC bus half-voltages are unbalanced; the 'BUSN' cable or the driver-board power supply cable may be loose.
How to fix it
- 1Check whether the 'BUSN' cable or the driver-board power supply cable is loose
- 2Restart 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+48
What it means
The DC busbar is unbalanced — The two halves of the split DC bus are at unequal voltages.
Cause: The 'BUSN' cable or the driver-board power-supply cable is loose, unbalancing the split DC bus.
How to fix it
- 1Check whether the 'BUSN' cable or the driver-board power-supply cable is loose.
- 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 · 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-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+15
What it means
The DC busbar is unbalanced — The two halves of the split DC bus are at unequal voltages.
Cause: The voltages of the two halves of the split DC bus became unequal.
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.53
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
The DC busbar is unbalanced — The DC busbar voltage is unbalanced.
Cause: When the hybrid inverter runs in split-phase mode and the load on L1 differs greatly from the load on L2, it reports F26.
How to fix it
- 1Wait for a while and check whether it returns to normal.
- 2In split-phase mode, balance the loads on L1 and L2.
- 3Restart the system 2-3 times.
- 4Seek 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
BUS Unbalance Fault — BusUnbalance_Fault - the internal DC BUS voltages are unbalanced.
Cause: The load power on the 3 phases differs greatly, or there is DC leakage current.
How to fix it
- 1Wait for a while and check whether it returns to normal
- 2Restart the system 2~3 times.
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 Busbar Unbalanced — The DC busbar is unbalanced - the internal DC BUS voltages are unbalanced.
Cause: When the hybrid inverter runs in split-phase mode and the load on L1 differs greatly from the load on L2, F26 is reported.
How to fix it
- 1Wait for a while and check whether it returns to normal
- 2Restart the system 2~3 times
- 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 Busbar Unbalanced — The DC busbar is unbalanced - the internal DC BUS voltages are unbalanced.
Cause: The load power of the 3 phases is very different, or there is DC leakage current.
How to fix it
- 1Wait for a while and check whether it returns to normal
- 2Restart the system 2~3 times
- 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.47 · 040_BManual_SUN-3_4_5_6_8_10_12K-SG05LP3-EU-SM2_20260319_en_b0183b7d.pdf, p.47 · 044_BManual_SUN-14_15_16_18_20K-SG05LP3-EU-SM2_20260319_en_ac7cdbd1.pdf, p.47
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
The DC busbar is unbalanced
Cause: Large load-power differences between the three phases, or DC leakage current, unbalanced the internal DC bus.
How to fix it
- 1Wait a while and check whether it returns to normal; balance the loads across phases and restart the system 2-3 times.
- 2Seek help from Deye if it persists.
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
BusUnbalance_Fault — The DC busbar is unbalanced.
Cause: Large load-power differences between the three phases, or DC leakage current, unbalanced the internal DC bus.
How to fix it
- 1Wait a while and check whether it returns to normal; balance the loads across phases and restart the system 2-3 times.
- 2Seek help from Deye if it persists.
Source: 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.50 · 010_Download_cc05df18.pdf, p.45
Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7
What it means
Cell voltage sampling fails — The cell-voltage sampling circuit returned invalid readings.
Cause: A fault in the voltage-sampling harness or measurement circuit inside the pack made cell-voltage readings invalid.
How to fix it
- 1Restart the battery.
- 2If the code persists, the pack needs internal service - 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_FUSE_BLOWN — Blown fuse.
Cause: The main pack fuse opened - an external short circuit or an extreme over-current event.
How to fix it
Take the battery out of service and contact Deye support; the cause of the over-current must be found and cleared before the fuse is replaced.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.13