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
GFDI grounding touch failure — The GFDI circuit reports a failed grounding contact. The manual notes this code has hardly ever appeared in the field.
Cause: The GFDI circuit detected a failed ground contact, so the ground-fault protection path is not intact.
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: 041_BManual_SUN-120_125_130_135_136K-G01P3-EU-BM8_20251021_en_a2166559.pdf, p.61 · 065_BManual_SUN-7_7.5_8K-G02P1-EU-AM2_20260625_en_4466f08b.pdf, p.50 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.50
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
GFDI grounding touch failure — The GFDI circuit reports a failed grounding contact.
Cause: The GFDI circuit detected a failed ground contact, so the ground-fault protection path is not intact.
How to fix it
Restart the inverter; if the fault is not ruled out, contact the installer or the manufacturer's customer service.
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+27
What it means
GFDI grounding touch failure — The GFDI circuit reports a grounding-contact failure.
Cause: Bad contact in the GFDI grounding path prevents the ground-fault protection from working properly.
How to fix it
Restart the inverter; if the fault is not ruled out, contact the installer or manufacturer customer service.
Source: 063_BManual_SUN-6K-G06-LV-P1_20250923_en_30a96699.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+36
What it means
GFDI grounding touch failure — The GFDI circuit reports a grounding-contact failure.
Cause: Bad contact in the GFDI grounding path prevents the ground-fault protection from working properly.
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.52 · 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-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
GFDI_Relay_Failure — Ground fault detector/interrupter (GFDI) relay failure.
Cause: In a split-phase (120/240Vac) or three-phase (120/208Vac) system the backup load port N line is not connected to ground, so the GFDI relay check fails.
How to fix it
- 1When the inverter is in a split-phase (120/240Vac) or three-phase (120/208Vac) system, connect the backup load port N line to ground.
- 2If the fault still exists, contact Deye for help.
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
DC/DC Converter 2 Start Failure — DCDC2_START_Failure - the BUS voltage cannot be reached by PV or battery.
Cause: DC/DC converter 2 failed to start because the internal BUS voltage could not be built up from the PV or battery input.
How to fix it
Switch off the DC switches and restart the inverter.
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-AM3
What it means
GFDI Relay Failure — GFDI_Relay_Failure - ground fault detector/interrupter relay fault.
Cause: In a split-phase (120/240Vac) or three-phase (120/208Vac) system, the backup load port N line is not connected to ground, so the GFDI relay check fails.
How to fix it
- 1In a split-phase (120/240Vac) or three-phase (120/208Vac) system, connect the backup load port N line to ground
- 2If the fault still exists, contact us for help.
Source: 059_BManual_SUN-5_6_7.6_8_10_12K-SG02LP2-US-AM2_AM3_20260406_en_fb6a30c7.pdf, p.54
Also applies to:RW-L2.5ARW-L5.1RW-L10.2RW-F16SE-F5SE-F5 PlusSE-F5 ProSE-F12+7
What it means
Cell under temperature — Cell temperature fell below the protection limit; charging is inhibited until the pack warms up.
Cause: The battery is in an environment colder than its rated charge/discharge temperature window.
How to fix it
Warm the installation space and wait for the battery to return to its operating temperature range; charging resumes once the cells are warm enough.
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_OVER_DIFF_TEMP_LEV_2 — Excessive temperature differences across the pack.
Cause: The temperature gap between measurement points exceeded the level-2 threshold - uneven heating/cooling of the cabinet or a drifting sensor.
How to fix it
- 1Check the battery is evenly ventilated and not partially exposed to a heat source; let temperatures equalize.
- 2If the code returns, contact Deye support.
Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.12