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 SUN2000 operating voltage.

Check the serial connection configuration of the PV string and ensure that the PV string open-circuit voltage is not greater than the maximum operating voltage of the SUN2000. After the PV array configuration is corrected, the alarm disappears.

2002

DC Arc Fault

Major

The PV string power cables arc or are in poor contact.

Cause ID = 1, 2

• 1: PV1 DC arc fault
• 2: PV2 DC arc fault

Check whether the string cables arc or are in poor contact.

2011

String Reversed

Major

The PV string is reversely connected.

Cause ID = 1, 2

• 1: PV1 is reversely connected.
• 2: PV2 is reversely connected.

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.

2021

AFCI Check Failure

Major

The AFCI check fails.

Cause ID = 1, 2

• 1: The AFCI check circuit is abnormal.
• 2: The AFCI circuit is faulty.

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.

2032

Grid Failure

Major

Cause ID = 1

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

1. Check the AC voltage.
2. Check whether the AC circuit is disconnected or the AC circuit breaker is OFF.

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 low voltage ride-through (LVRT).

1. If the alarm occurs occasionally, the power grid may be abnormal temporarily. The SUN2000 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 allowed range. If no, contact the local power operator. If yes, modify the grid undervoltage protection threshold through the mobile App, SmartLogger, or network management system (NMS) with the consent of the local power operator.
3. If the fault persists for a long time, 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 has lasted for more than the value specified by high voltage ride-through (HVRT).

1. If the alarm occurs occasionally, the power grid may be abnormal temporarily. The SUN2000 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 allowed range. If no, contact the local power operator. If yes, modify the grid overvoltage protection threshold through the mobile App, SmartLogger, or NMS 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 operator.

2036

Grid Overfrequency

Major

Cause ID = 1

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

1. If the alarm occurs occasionally, the power grid may be abnormal temporarily. The SUN2000 automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the power grid frequency is within the allowed range. If no, contact the local power operator. If yes, modify the grid overfrequency protection threshold through the mobile App, SmartLogger, or NMS with the consent of the local power operator.

2037

Grid Underfrequency

Major

Cause ID = 1

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

1. If the alarm occurs occasionally, the power grid may be abnormal temporarily. The SUN2000 automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the power grid frequency is within the allowed range. If no, contact the local power operator. If yes, modify the grid underfrequency protection threshold through the mobile App, SmartLogger, or NMS 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 occasionally, the power grid may be abnormal temporarily. The SUN2000 automatically recovers after detecting that the power grid becomes normal.
2. If the alarm occurs frequently, check whether the power grid frequency is within the allowed range. If no, contact the local power operator.

2039

Output Overcurrent

Major

Cause ID = 1

The power grid voltage drops dramatically or the power grid is short-circuited. As a result, the SUN2000 transient output current exceeds the upper threshold and therefore the SUN2000 protection is triggered.

1. The SUN2000 detects its external working conditions in real time. After the fault is rectified, the SUN2000 automatically recovers.
2. If the alarm occurs frequently and affects the energy yield of the power 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 of the SUN2000 output current exceeds the specified upper threshold.

1. The SUN2000 detects its external working conditions in real time. After the fault is rectified, the SUN2000 automatically recovers.
2. If the alarm occurs frequently, contact your dealer or Huawei technical support.

2051

Abnormal Residual Current

Major

Cause ID = 1

The insulation impedance of the input side to PE decreases when the SUN2000 is operating.

1. If the alarm occurs occasionally, the external circuit may be abnormal temporarily. The SUN2000 automatically recovers after the fault is rectified.
2. If the alarm occurs frequently or persists, check whether the impedance between the PV string and the ground is too low.

2062

Low Insulation Resistance

Major

Cause ID = 1

• A short circuit occurs between the PV array and the ground.
• The ambient air of the PV array is damp and the insulation between the PV array and the ground is poor.

1. Check the output impedance of the PV array to ground. If there is a short circuit or lack of insulation, rectify it.
2. Check that the PE cable of the SUN2000 is correctly connected.
3. If the impedance is lower than the specified protection threshold in rainy and cloudy days, set Insulation resistance protection using the mobile App, SmartLogger, or NMS.

   Current insulation resistance: x MΩ, possible short circuit position: x%. The short circuit position is valid for a single PV string. If there are multiple PV strings, check the PV strings one by one. For details, see Locating Insulation Resistance Faults.

2063

Overtemperature

Minor

Cause ID = 1

• The SUN2000 is installed in a place with poor ventilation.
• The ambient temperature is higher than the upper threshold.
• The SUN2000 is not working properly.

• Check the ventilation and ambient temperature of the SUN2000 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

An unrecoverable fault has occurred on a circuit inside the SUN2000.

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.

2065

Upgrade Failed or Version Mismatch

Minor

The upgrade does not complete normally.

1. Perform an upgrade again.
2. If the upgrade fails for multiple times, contact your dealer or Huawei technical support.

61440

Monitoring Unit Faulty

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

The smart power sensor is disconnected.

1. Check that the configured power meter model is the same as the actual model.
2. Check that the communications parameters for the smart power sensors are the same as the SUN2000 RS485 configurations.
3. Check whether the smart power sensor is powered on and whether the RS485 communications cable is connected.

2068

Battery Abnormal

Minor

The battery is faulty, disconnected, or the battery circuit breaker is OFF when the battery is running.

1. If the battery fault indicator is steady on or blinking, contact the battery supplier.
2. Check that the battery enabling/power/communications cable is correctly installed, and that the communications parameters are the same as the SUN2000 RS485 configurations.
3. Check that the auxiliary power switch on the battery is set to ON.
4. Send a shutdown command on the App. Turn off the AC output switch, DC input switch, and battery switch. Then turn on the battery switch, AC output switch, and DC input switch in sequence after 5 minutes.
5. If the fault persists, contact your dealer or Huawei technical support.

2070

Active Islanding

Major

Cause ID = 1

When the power grid experiences an AC power outage, the SUN2000 detects islanding proactively.

Check that the grid connection voltage of the SUN2000 is normal.

2077

Off-grid output overload

Major

Cause ID = 1/2

The output is overloaded or short-circuited.

1. Check whether the device output is short-circuited.
2. Check whether the device load configuration exceeds the rated value.

2080

Abnormal PV Module Configuration

Major

PV module configuration does not meet requirements, or the PV module output is reversely connected or short-circuited.

Cause ID = 2, 3, 6, 7, 8, 9

• 2: The PV string power or the number of optimizers connected in series in a PV string exceeds the upper threshold.
• 3: The number of optimizers connected in series in a PV string is less than the lower threshold, the PV string output is reversely connected, or the output of some optimizers in the PV string is reversely connected.
• 6: Under the same MPPT, the number of optimizers connected in series in PV strings connected in parallel is different, or the output of some optimizers in PV strings is reversely connected.
• 7: The optimizer installation position is changed, or PV strings are combined or exchanged.
• 8: The sunlight is weak or changes abnormally.
• 9: In partial configuration scenarios, the PV string voltage exceeds the inverter input voltage specifications.

2081

Optimizer Fault

Warning

Cause ID = 1

An optimizer is faulty.

Go to the optimizer information screen to view the fault details.

2082

Grid-tied/Off-grid Controller Abnormal

Major

Cause ID = 1

The inverter fails to communicate with the Smart Backup Box.

Cause ID = 2

An unrecoverable fault occurs on a circuit inside the Smart Backup Box.

1. Send a shutdown command on the App. Turn off the AC output switch, DC input switch, and battery switch.
2. Check whether the power cable and RS485 cable between the Smart Backup Box and the inverter are normal.
3. After 5 minutes, turn on the battery switch, AC output side, AC output switch, and DC input switch.
4. If the alarm persists, contact your dealer or Huawei technical support.