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
Reserved — Reserved code; in practice it is raised when a grid phase is lost or the AC voltage detection/relays do not close.
Cause: Loss of one grid phase, a failure in the AC voltage detection part, or relays that did not close.
How to fix it
Restart the inverter; if the error 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.61
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
Working mode changed/Grid mode changed — The working mode or grid mode of the inverter changed. The manual notes this code has hardly ever appeared in the field.
Cause: The inverter's working mode or grid mode setting was changed while it was operating.
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
Reserved — Reserved code; in practice it is raised when a grid phase is lost or the AC voltage detection/relays do not close.
Cause: Loss of one grid phase, a failure in the AC voltage detection part, or relays that did not close.
How to fix it
Restart the inverter; if the error still exists, contact your installer.
Source: 033_BManual_SUN-70_75_80_90_100_110K-G03_20260702_en_a9db1e1b.pdf, p.60 · 042_BManual_SUN-120_125_130_135_136K-G01P3-EU-AM8_20260702_en_05f936e3.pdf, p.60 · 060_BManual_SUN-60_70_75K-G01P3-EU-AM8-LV_20260701_en_f559aeec.pdf, p.60 · +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
Reserved — Reserved code; in practice it indicates loss of one grid phase, an AC voltage-detection failure, or relays not closed.
Cause: Loss of one phase, a failure of the AC voltage detection part, or relays not closed.
How to fix it
Restart the inverter; if the error still exists, contact your installer or Deye service.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.pdf, p.56 · 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-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
Working mode changed/Grid mode changed — The inverter's working mode or grid mode changed.
Cause: The configured working mode or grid mode was changed while the inverter was operating.
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
Working mode change — The inverter's working mode has changed; this fault normally clears automatically.
Cause: Reported when the grid type and frequency are changed, when the battery mode is changed to 'No battery' mode, or, on some old firmware versions, when the system work mode is changed.
How to fix it
- 1Generally it disappears automatically.
- 2If it stays, turn off the DC switch and AC switch, wait one minute, then turn the DC/AC switches back on.
- 3Seek 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.49 · 043_BManual_SUN-12_14_16K-SG01LP1-EU_20260519_en_703e15ac.pdf, p.45 · 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
Working Mode Change — Working_Mode_Change - the inverter's working mode has been changed.
Cause: The grid type or frequency setting has been changed, the battery mode has been changed to 'No battery' mode, or (on some old firmware versions) the system's work mode has been changed.
How to fix it
- 1Generally this error disappears automatically.
- 2If it remains the same, turn off the DC and AC switches for one minute, then turn on the DC and AC switches.
Source: 037_BManual_SUN-5_6_8_10_12_15_20_25K-SG01HP3-EU-AM2_20260224_en_9ef2717c.pdf, p.49 · 050_BManual_SUN-29.9_30_35_40_50K-SG01HP3-EU-BM3_4_20260224_en_544e1b2f.pdf, p.50 · 062_BManual__SUN-60_70_75_80K-SG02HP3-EU-EM6_20260224_en_38cbc9f6.pdf, p.50
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-AM3SUN-5K-SG04LP3-EUSUN-6K-SG04LP3-EU+15
What it means
Working Mode Change — Working mode change - the inverter's working mode has been changed.
Cause: The grid type or frequency setting has been changed, the battery mode has been changed to 'No battery' mode, or (on some old firmware versions) the system's work mode has been changed.
How to fix it
- 1Generally it disappears automatically.
- 2If it stays the same, turn off the DC switch and AC switch, wait for one minute, then turn on the DC/AC switches.
- 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 · 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 · +1 more official manuals
Energy storage systemWarning 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
Working mode change — Working mode change notice.
Cause: Reported when the grid type/frequency setting changes, when the battery mode is set to 'No battery', or (on older firmware) when the system work mode changes.
How to fix it
- 1It generally disappears automatically.
- 2If it stays, turn off the DC and AC switches, wait one minute, and turn them back on; seek help from Deye if it will not clear.
Source: 002_Download_4e90fe7a.pdf, p.46
Energy storage systemWarning 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
Working_Mode_change — Working mode change notice.
Cause: Reported when the grid type/frequency setting changes, when the battery mode is set to 'No battery', or (on older firmware) when the system work mode changes.
How to fix it
- 1It generally disappears automatically.
- 2If it remains, switch the DC and AC switches off for one minute and back on; seek help from Deye if it will not clear.
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
Mos over temperature — The BMS power MOSFETs exceeded their temperature limit.
Cause: High continuous current combined with high ambient temperature or blocked ventilation overheated the BMS switching MOSFETs.
How to fix it
- 1Reduce the charge/discharge current, let the battery cool, and improve ventilation.
- 2If it recurs at moderate current, 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_SOUTH_CONNECTOR_OVER_TEMP_LEV_2 — The temperature of the BMU connector is too high.
Cause: A loose or high-resistance connection at the BMU power connector heated up under current.
How to fix it
- 1Switch off, let it cool, and check/re-seat and torque the BMU connector and cabling.
- 2Contact Deye support if the heating returns.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.13