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 busbar voltage is too high — The DC bus voltage is above the limit.
Cause: The DC bus (Ubus) voltage is above the limit - usually the PV input voltage is too high because too many solar panels are connected in series, or the Ubus detection circuit is faulty.
How to fix it
- 1Check the PV voltage and the Ubus voltage and their detection circuit; if the PV input voltage exceeds the limit, reduce the number of solar panels in series
- 2For the Ubus voltage, check the LCD display.
Source: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.63 · 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.53 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.53 · +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 busbar voltage is too high — The DC bus voltage exceeded its upper limit.
Cause: PV input voltage above the permitted limit (too many solar panels in series), or a problem in the Ubus voltage detection circuit.
How to fix it
Check the PV voltage, the Ubus voltage, and its detection circuit; if the PV input voltage exceeds the limit, reduce the number of solar panels in series; check the Ubus voltage on the LCD display.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.59 · 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.55 · 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-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
Battery 1 Voltage High — BAT1_VoltHigh_Fault - the terminal voltage of battery input 1 is too high.
Cause: The voltage measured at the battery 1 terminals is above the limit.
How to fix it
- 1Check whether the battery 1 terminal voltage is high
- 2Restart the inverter 2 times and restore the factory settings.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.52 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.53 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.53
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 Voltage Too High — DC busbar voltage is too high - the internal BUS voltage is too high.
Cause: The DC busbar (BUS) voltage is too high because the battery voltage is too high or the PV input voltage is outside the allowed range.
How to fix it
- 1Check whether the battery voltage is too high
- 2Check the PV input voltage and make sure it is within the allowed range
- 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
DC busbar voltage is too high — BUS voltage is too high.
Cause: The internal BUS voltage exceeded its limit - battery voltage too high or PV input voltage above the allowed range.
How to fix it
- 1Check whether the battery voltage is too high and that the PV input voltage is within the allowed range.
- 2Seek help from Deye if it does not recover.
Source: 002_Download_4e90fe7a.pdf, p.48
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
BAT1_VoltHigh_Fault — Battery 1 terminal voltage is too high.
Cause: The voltage measured at the battery 1 terminals exceeded the limit - battery over-voltage or wrong battery settings.
How to fix it
- 1Check the battery 1 terminal voltage, restart the inverter twice and restore the factory settings.
- 2Seek help from Deye if it does not recover.
Source: 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.51 · 010_Download_cc05df18.pdf, p.46
Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7
What it means
TEMP_OPEN_WIRE_FAIL — An open wire was detected in the temperature-sensor harness.
Cause: A temperature-sensor lead is broken or disconnected, so the BMS reads an open circuit on that channel.
How to fix it
- 1Restart the battery.
- 2If the code persists, 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_W5500_SPI_COMM_FAIL — The W5500 (Ethernet controller) SPI communication fails.
Cause: The BMS lost internal SPI communication with its W5500 Ethernet controller chip - a fault on the network interface, affecting monitoring connectivity.
How to fix it
- 1Restart the system.
- 2If the fault persists, contact Deye support for service of the communication board.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.14