20Fault

DEYE inverter error 20 (F020)

DC over current fault of the hardware

Also displayed as F020 / F20 on some models.

Fault — the inverter cuts its output and the red LED stays solid until the fault is cleared.

The exact meaning depends on your model:

SUN G01P3-EU-BM8 Series

InverterFault

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

DC over current fault of the hardware — Hardware-level DC over-current protection tripped.

Cause: The DC input current exceeded the hardware protection limit: solar panel output current above the allowed range, a DC current sensor or detection-circuit fault, or firmware that does not match the hardware.

How to fix it

  1. Check whether the solar panel output current is within the allowed range
  2. Check the DC current sensor and its detection circuit
  3. Check that the inverter firmware version is suitable for the hardware
  4. 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

SUN G02P1-EU Series

InverterFault

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

DC over current fault of the hardware — Hardware-level DC over-current protection tripped. Marked 'Not available' in the manual for these models.

Cause: Hardware-level DC input over-current protection; this code is not used on these single-phase models.

How to fix it

  1. Marked 'Not available' in the manual - this code is not used on these models.
  2. If 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.51 · 032_BManual_SUN-9_10_10.5K-G02P1-EU-AM2_20260625_en_df0f2106.pdf, p.51

SUN G03/G01P3-AM8 Series

InverterFault

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

DC over current fault of the hardware — Hardware-level DC over-current protection tripped.

Cause: The DC input current exceeded the hardware protection limit: solar panel output current above the allowed range, a DC current sensor or detection-circuit fault, or firmware that does not match the hardware.

How to fix it

  1. Check whether the solar panel output current is within the allowed range
  2. Check the DC current sensor and its detection circuit
  3. Check that the inverter firmware version is suitable for the hardware
  4. 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

SUN G04/G05/G06 3-Phase

InverterFault

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

DC over current fault of the hardware — The DC-side hardware over-current protection tripped.

Cause: Solar-panel output current outside the allowed range, a faulty DC current sensor or its detection circuit, or a firmware version not suitable for the hardware.

How to fix it

  1. Check that the solar panel output current is within the allowed range; check the DC current sensor and its detection circuit; check that the inverter firmware version suits the hardware.
  2. 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.57 · 036_BManual_SUN-3_4_5_6_7_8_9_10_12_15K-G06P3-EU-BM2_20250506_en_0eb78440.pdf, p.57

SUN G04P1/G05P1 Series

InverterFault

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

DC over current fault of the hardware — The DC-side hardware over-current protection (marked 'Not available' on these single-phase models).

Cause: Hardware DC over-current protection; this code is not used on these single-phase models.

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.53

SUN LP1 Hybrid Series

InverterFault

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

DC over current fault of the hardware — DC side over current fault detected by the hardware.

Cause: A PV module or battery connection problem, or, in off-grid mode, the inverter starting up with a large load power.

How to fix it

  1. Check the PV module and battery connections.
  2. In off-grid mode, reduce the connected load power if the inverter starts up with big power of load.
  3. Turn off the DC switch and AC switch, wait one minute, then turn the DC/AC switches on again.
  4. Seek 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

SUN SG01HP3/SG02HP3 Hybrid

InverterFault

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 Transient Overcurrent (Hardware) — Tz_Dc_OverCurr_Fault - DC side overcurrent fault detected by hardware.

Cause: The DC-side current exceeded the hardware protection limit; a PV module or battery connection problem, or starting the inverter under a high power load in off-grid mode, can trigger it.

How to fix it

  1. Check the PV module connection and battery connection
  2. In off-grid mode, starting the inverter under a high power load may report F20 - reduce the connected load power
  3. If 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.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

SUN SG02LP2-US Hybrid

InverterFault

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

DC Overcurrent (Hardware) — DC over current fault of the hardware - DC side overcurrent fault.

Cause: The DC-side current exceeded the hardware protection limit; a PV module or battery connection problem, or starting the inverter under a high power load in off-grid mode, can trigger it.

How to fix it

  1. Check the PV module connection and battery connection
  2. In off-grid mode, starting the inverter with a high power load may report F20 - reduce the connected load power
  3. Turn off the DC switch and AC switch, wait one minute, then turn on the DC/AC switches again
  4. Seek 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

AI-W5.1 ESS

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 over current fault of the hardware — DC side over-current fault (hardware detection).

Cause: DC-side current exceeded the hardware limit - a PV module or battery connection problem, or an off-grid start-up with a large load.

How to fix it

  1. Check the PV module and battery connections; in off-grid mode reduce the connected load.
  2. Turn off the DC and AC switches, wait one minute, then turn them back on; seek help from Deye if it does not recover.

Source: 002_Download_4e90fe7a.pdf, p.46

GB-SL / GB-SL Pro ESS

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

Tz_Dc_OverCurr_Fault — DC side over-current fault (hardware detection).

Cause: DC-side current exceeded the hardware limit - a PV module or battery connection problem, or an off-grid start-up with a large load.

How to fix it

  1. Check the PV module and battery connections; in off-grid mode reduce the connected load.
  2. If it remains, switch the DC and AC switches off for one minute and back on; seek help from Deye if it does not recover.

Source: 081_deye_gb_sl_pro_user_manual_46fa941a.pdf, p.49 · 010_Download_cc05df18.pdf, p.44

GB-A HV Battery

BatteryFault

Also applies to:GB-A

What it means

ALARM_ID_DSG_RELAY_ADHESION — Discharge relay adhesion (the manual's description column here reads 'the total voltage is too low'; the alarm ID identifies stuck discharge-relay contacts).

Cause: The BMS self-test found the discharge relay contacts stuck (welded) closed, so the discharge path can no longer be opened.

How to fix it

  1. Switch the battery off and take it out of service; the relay must be serviced.
  2. Contact Deye support.

Source: 008_deye_ess_user_manual_gb_a_jpnen_v02_20250829_3fea617e.pdf, p.13

Frequently asked questions

What does error 20 mean on a DEYE inverter?
It depends on the model — 13 devices use code 20. On the SUN G01P3-EU-BM8 Series it means: DC over current fault of the hardware. The card for each model on this page gives its exact meaning and fix.
Is error 20 a fault or a warning?
20 is a fault code: the inverter cuts its output and the red LED stays solid until it is cleared.
How do I clear or fix error 20?
1. Check whether the solar panel output current is within the allowed range. The exact steps for each affected model are listed on this page.

Related error codes

Other codes on the SUN G01P3-EU-BM8 Series

All SUN G01P3-EU-BM8 Series codes

Other codes on the SUN G02P1-EU Series

All SUN G02P1-EU Series codes

Other codes on the SUN G03/G01P3-AM8 Series

All SUN G03/G01P3-AM8 Series codes

Other codes on the SUN G04/G05/G06 3-Phase

All SUN G04/G05/G06 3-Phase codes All SUN G06P3-EU Series codes

Other codes on the SUN G04P1/G05P1 Series

All SUN G04P1/G05P1 Series codes

Other codes on the SUN LP1 Hybrid Series

All SUN LP1 Hybrid Series codes

Prefer the full written guide? Read the complete DEYE inverter error-code guide

Compiled from official DEYE user manuals. Always consult your device manual and a qualified technician before performing repairs.