Also applies to:SUN-120K-G01P3-EU-BM8SUN-125K-G01P3-EU-BM8SUN-130K-G01P3-EU-BM8SUN-135K-G01P3-EU-BM8SUN-136K-G01P3-EU-BM8SUN-60K-G03SUN-70K-G03SUN-75K-G03+12
What it means
AC Line U,V low voltage — The U-V line voltage is below the protection setting.
Cause: The line voltage between phases U and V is below the protection setting.
How to fix it
Check the AC voltage protection setting.
Source: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.63 · 033_BManual_SUN-70_75_80_90_100_110K-G03_20260702_en_a9db1e1b.pdf, p.63 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.62 · +2 more official manuals
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
AC Line U,V low voltage — The U-V line voltage is below the protection setting. Marked 'Not available' in the manual for these models.
Cause: Line voltage protection between phases U and V - a three-phase measurement that is not used on these single-phase models.
How to fix it
- 1Marked 'Not available' in the manual - this code is not used on these models.
- 2If it is displayed nonetheless, restart the inverter and contact your installer or Deye service.
Source: 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.52 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.52
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
AC Line U,V low voltage — The line voltage between phases U and V is below the protection setting.
Cause: Grid U-V line voltage below the protection setting.
How to fix it
Check the AC voltage protection setting.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.58 · 036_BManual_SUN-3_4_5_6_7_8_9_10_12_15K-G06P3-EU-BM2_20250506_en_0eb78440.pdf, p.58
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
AC Line U,V low voltage — Line low-voltage protection for the U-V pair (marked 'Not available' on single-phase models).
Cause: Line-voltage protection for the U-V phase pair; single-phase units have no such line pair, so the code is not used.
How to fix it
Marked 'Not available' on these single-phase models - the code is not used.
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.54
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
Grid Undervoltage — AC_UV_UnderVolt_Fault - grid voltage out of range (too low).
Cause: The grid voltage is below the range given in the specification.
How to fix it
- 1Check that the voltage is in the range of the specification
- 2Check whether the AC cables are firmly and correctly connected.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.51 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.52 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.52
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
Backup Battery Fault — Backup battery fault - the battery status is abnormal or inconsistent.
Cause: The status of the batteries is inconsistent - voltage, SOC or other parameters differ between the batteries.
How to fix it
- 1Check each battery's status, such as voltage/SOC and other parameters, and make sure all the parameters are the same
- 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.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
Backup battery fault — Backup battery fault - paralleled batteries are inconsistent.
Cause: One of the connected batteries has voltage, SOC, or parameter settings that do not match the others.
How to fix it
- 1Check each battery's status (voltage, SOC, and parameters) and make sure all parameters are the same.
- 2If the fault still exists, contact Deye for help.
Source: 002_Download_4e90fe7a.pdf, p.48
Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7
What it means
Mos Adhesion Susp — The BMS suspects a main MOSFET is stuck conducting.
Cause: The self-test result suggests MOSFET contact adhesion - the switch may no longer open the circuit reliably.
How to fix it
- 1Power-cycle the battery to re-run the self-test.
- 2If the code returns, take the battery out of service and 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_PRECHAGE_ERROR — The precharge failed.
Cause: The precharge circuit could not raise the bus voltage - a short or very large capacitive load on the DC bus, or a failed precharge resistor.
How to fix it
- 1Disconnect and check the DC bus and PCS side for shorts, then restart.
- 2If precharge still fails, contact Deye support.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.14