Troubleshooting

2001

High String Input Voltage

Major

The PV array is not properly configured. Excessive PV modules are connected in series to the PV string, and therefore the open-circuit voltage exceeds the maximum inverter operating voltage.

Cause ID 1 = PV1 and PV2

Cause ID 2 = PV3 and PV4

Reduce the number of PV modules connected in series to the PV string until the PV string open-circuit voltage is less than or equal to the maximum inverter operating voltage. After the PV array is correctly configured, the inverter alarm disappears.

2002

DC Arc Fault

Major

The PV string power cable arcs or is in poor contact.

Cause ID 1 = PV1 and PV2

Cause ID 2 = PV3 and PV4

Check that the PV string power cable does not arc and is in good contact.

2011

String Reverse Connection

Major

The PV string polarity is reversed.

Cause ID 1 = PV1

Cause ID 2 = PV2

Cause ID 3 = PV3

Cause ID 4 = PV4

Check whether the PV string is reversely connected to the SUN2000. If yes, wait until the PV string current decreases below 0.5 A, set DC SWITCH to OFF, and adjust the PV string polarity.

2012

String Current Backfeed

Warning

The number of PV modules connected in series to this PV string is insufficient. As a result, the end voltage is lower than that of other strings.

Cause ID 1 = PV1

Cause ID 2 = PV2

Cause ID 3 = PV3

Cause ID 4 = PV4

1. Check whether the number of PV modules connected in series to this PV string is less than the number of PV modules connected in series to the other PV strings connected in parallel with this PV string. If yes, wait until the PV string current decreases below 0.5 A, set DC SWITCH to OFF, and adjust the number of PV modules in the PV string.
2. Check whether the PV string is shaded.
3. Check whether the open-circuit voltage of the PV string is normal.

2021

AFCI Self-Check Failure

Major

Cause ID = 1, 2

AFCI check fails.

Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, contact your dealer or Huawei technical support.

2031

Phase Wire Short-Circuited to PE

Major

Cause ID = 1

The impedance of the output phase wire to PE is low or the output phase wire is short-circuited to PE.

Check the impedance of the output phase wire to PE, locate the position with lower impedance, and rectify the fault.

2032

Grid Loss

Major

Cause ID = 1

• The power grid experiences an outage.
• The AC power cable is disconnected or the AC circuit breaker is OFF.

1. Check that the AC voltage is normal.
2. Check that the AC power cable is connected and that the AC switch is ON.

2033

Grid Undervoltage

Major

Cause ID = 1

The grid voltage is below the lower threshold or the low voltage duration has lasted for more than the value specified by LVRT.

1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the grid voltage is within the acceptable range. If no, contact the local power operator. If yes, login to the mobile phone app, SmartLogger, or NMS to modify the grid undervoltage protection threshold with the consent of the local power operator.
3. If the fault persists, check the connection between the AC switch and the output power cable.

2034

Grid Overvoltage

Major

Cause ID = 1

The grid voltage exceeds the higher threshold or the high voltage duration has lasted for more than the value specified by HVRT.

1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the power grid voltage is within the acceptable range. If no, contact the local power operator. If yes, log in to the mobile app, SmartLogger, or network management system (NMS) to modify the grid overvoltage protection threshold with the consent of the local power operator.
3. Check whether the peak voltage of the power grid is too high. If the fault persists and cannot be rectified for a long time, contact the power grid operator.

2035

Grid Voltage Imbalance

Major

Cause ID = 1

The difference between grid phase voltages exceeds the upper threshold.

1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the power grid voltage is within the acceptable range. If no, contact the local power operator.
3. If the fault persists for a long time, check the connection of the AC output power cables.
4. If the AC output power cables are correctly connected, but the alarm persists and affects the energy yield of the PV plant, contact the local power operator.

2036

Grid Overfrequency

Major

Cause ID = 1

Power grid exception: The actual grid frequency is higher than the requirement of the local power grid standard.

1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator. If yes, log in to the mobile phone app, SmartLogger, or NMS to modify the grid underfrequency protection threshold with the consent of the local power operator.

2037

Grid Underfrequency

Major

Cause ID = 1

Power grid exception: The actual grid frequency is lower than the requirement of the local power grid standard.

1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator. If yes, log in to the mobile phone app, SmartLogger, or NMS to modify the grid underfrequency protection threshold with the consent of the local power operator.

2038

Unstable Grid Frequency

Major

Cause ID = 1

Power grid exception: The actual grid frequency change rate does not comply with the local power grid standard.

1. If the alarm occurs accidentally, the power grid may be abnormal temporarily. The inverter automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the grid frequency is within the acceptable range. If no, contact the local power operator.

2039

Output Overcurrent

Major

Cause ID = 1

The grid voltage drops dramatically or the power grid is short-circuited. As a result, the inverter transient output current exceeds the upper threshold, and inverter protection is triggered.

1. The inverter monitors its external working conditions in real time. The inverter automatically recovers after the fault is rectified.
2. If the alarm occurs frequently and affects the power production of the PV plant, check whether the output is short-circuited. If the fault persists, contact your dealer or Huawei technical support.

2040

Output DC Component Overhigh

Major

Cause ID = 1

The DC component in the grid current exceeds the upper threshold.

1. The inverter monitors its external working conditions in real time. The inverter automatically recovers after the fault is rectified.
2. If the alarm occurs frequently, contact your dealer or Huawei technical support.

2051

Abnormal Residual Current

Major

Cause ID = 1

The input-to-ground insulation impedance has decreased during the inverter operation.

1. If the alarm occurs accidentally, the external power cable may be abnormal temporarily. The inverter automatically recovers after the fault is rectified.
2. If the alarm occurs frequently or persists, check that the impedance between the PV string and ground is not below the lower threshold.

2061

Abnormal Grounding

Major

Cause ID = 1

• The neutral wire or ground cable is not connected.
• The PV array is grounded, but the inverter output does not connect to an isolation transformer.

Power off the inverter (turn off the AC output switch and DC input switch, and wait for 5 minutes), and then perform the following operations:

1. Check that the PE cable for the inverter is connected properly.
2. If the inverter is connected to the TN power grid, check whether the N cable is properly connected and whether the voltage to ground is normal.
3. Check whether the AC output connects to an isolation transformer. If yes, after powering on the inverter, log in to the mobile phone app, SmartLogger, or NMS and disable Grounding inspection.

2062

Low Insulation Resistance

Major

2063

Cabinet Overtemperature

Minor

Cause ID = 1

• The inverter is installed in a place with poor ventilation.
• The ambient temperature exceeds the upper threshold.
• The inverter is not working properly.

• Check the ventilation and ambient temperature at the inverter installation position.
• If the ventilation is poor or the ambient temperature exceeds the upper threshold, improve the ventilation and heat dissipation.
• If the ventilation and ambient temperature both meet requirements, contact your dealer or Huawei technical support.

2064

Device Fault

Major

Cause ID = 1–12

An unrecoverable fault has occurred on a circuit inside the inverter.

Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, contact your dealer or Huawei technical support.

Note: If the cause ID is ID 1, perform the preceding operation when the PV string current is less than 1 A.

2065

Upgrade Failed or Version Mismatch

Minor

Cause ID = 1, 2 and 4

The upgrade ends abnormally.

1. Upgrade again.
2. If the upgrade fails several times, contact your dealer or Huawei technical support.

2066

License Expired

Warning

Cause ID = 1

• The privilege certificate has entered the grace period.
• The privilege feature will be invalid soon.

1. Apply for a new certificate.
2. Load the new certificate.

61440

Faulty Monitoring Unit

Minor

Cause ID = 1

• The flash memory is insufficient.
• The flash memory has bad sectors.

Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. If the fault persists, replace the monitoring board or contact your dealer Huawei technical support.

2067

Faulty Power Collector

Major

Cause ID = 1

Power meter disconnection.

1. Check that the preset power meter model is the same as the actual model.
2. Check that the preset communications parameters for the power meter are the same as the actual configurations.
3. Check that the power meter is powered on and the RS485 communications cable is connected.

2072

Transient AC Overvoltage

Major

Cause ID = 1

The inverter detects that the phase voltage exceeds the transient AC overvoltage protection threshold.

1. Check whether the grid connection voltage exceeds the upper threshold. If yes, contact the local power operator.
2. If you have confirmed that the grid connection voltage exceeds the upper threshold and obtained the consent of the local power operator, modify the overvoltage protection threshold.
3. Check that the peak grid voltage does not exceed the upper threshold.