Troubleshooting

2001

High String Input Voltage

Major

Reduce the number of PV modules connected in series in the PV string until the PV string open-circuit voltage is not greater than the maximum operating voltage of the inverter. After the PV array configuration is corrected, the alarm disappears.

2011

String Reverse Connection

Major

The PV string is reversely connected.

Cause ID 1–18: PV strings 1–18

1. Check whether the PV string is connected to the device in reverse polarity. If yes, wait until the PV string current decreases to below 0.5 A, set DC SWITCH to OFF, and adjust the PV string polarity.
2. If the fault persists, reset the device on the local maintenance app or WebUI of the upper-layer controller. Alternatively, you can turn off the AC and DC switches, wait for 5 minutes, and then turn on the AC and DC switches.

2012

String Current Backfeed

Warning

Only a few PV modules are connected in series in the PV string. Therefore, the end voltage is lower than that of other PV strings.

Cause ID 1–18: PV strings 1–18

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

2014

High input string voltage to ground

Major

Cause ID = 1

The voltage between the input PV modules and the ground is abnormal, and there is a risk of power degradation.

1. If no PID compensation device exists in the system, disable the PID protection function at night. Note: If the PID protection function is disabled but reactive power compensation at night is enabled, PV modules may be degraded.
2. If the system has a PID compensation device, check whether the device is abnormal. If yes, rectify the fault.
3. Check whether the settings of compensation direction for the inverter and the PID compensation device are consistent. If not, set them to be consistent based on the PV module model. (Note: If the PV– is set to positive offset, the voltage between the inverter PV– and the ground should be greater than 0 V to clear the alarm; if the PV+ is set to negative offset, the voltage between the inverter PV+ and the ground should be less than 0 V to clear the alarm.)
4. If the alarm persists, contact your dealer or Huawei technical support.

2015

PV String Loss

Warning

This alarm is generated when the PV string status is abnormal in the following conditions:

• A single PV string is lost.
• Both 2-in-1 PV strings are lost.
• Either of the 2-in-1 PV strings is lost.

Cause ID 1–8: PV strings 1–18

1. If the PV string access type is manually set, check whether it is consistent with the actual access status.
2. Check whether the inverter terminals are properly connected.
3. Check whether the PV string terminals are properly connected.
4. If a 2-in-1 terminal is used, check whether it is normal.

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

1. The power grid experiences an outage.
2. The AC circuit is disconnected or the AC switch is off.

1. The alarm is automatically cleared after the power grid is restored.
2. Check whether the AC circuit is disconnected or the AC switch is off.

2033

Grid Undervoltage

Major

Cause ID=1

The grid voltage is below the lower threshold or the undervoltage duration has exceeded the time that triggers LVRT.

1. If the alarm occurs occasionally, 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 not, 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 AC circuit breaker and AC output power cable.

2034

Grid Overvoltage

Major

Cause ID=1

The grid voltage is beyond the upper threshold or the overvoltage duration has exceeded the time that triggers HVRT.

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-tied voltage exceeds the upper threshold and have obtained the consent of the local power operator, modify the overvoltage protection threshold through the mobile app, SmartLogger, or NMS.
3. Check whether the peak grid voltage exceeds the upper threshold.

2035

Grid Voltage Imbalance

Major

Cause ID=1

The difference between grid phase voltages exceeds the upper threshold.

1. Check that the grid voltage is within the normal range.
2. Check that the AC output power cable is correctly connected. If the AC output power cable is correctly connected, yet the alarm persists and affects the energy yield of the power plant, contact the local 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 inverter 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 acceptable range. If not, 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 inverter 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 acceptable range. If not, 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 inverter 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 acceptable range. If not, contact the local power operator.

2039

AC Overcurrent

Major

Cause ID = 1

The grid experiences a dramatic voltage drop or is short-circuited. As a result, the transient AC current of the device exceeds the upper threshold and triggers protection.

1. The device detects its external working conditions in real time. After the fault is rectified, the device automatically recovers.

2. If the alarm occurs frequently and affects the operation of the power plant, check whether AC short circuit exists. If the fault persists, contact your dealer or technical support.

2040

Output DC Component Overhigh

Major

Cause ID=1

The DC component of the inverter output current exceeds the specified upper threshold.

1. If the exception is caused by an external fault, the inverter automatically recovers after the fault is rectified.
2. If this alarm occurs frequently and affects the energy yield of the PV plant, 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 inverter is operating.

1. If the alarm occurs occasionally, the external circuit may be abnormal temporarily. The inverter 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

1. The PV string is short-circuited to the PE cable.
2. The PV string has been in a moist environment for a long time and the circuit is not well insulated to ground.

1. Check the impedance of the PV string to PE. If a short circuit occurs, rectify it.
2. Check that the ground cable of the inverter is correctly connected.
3. If you are sure that the impedance is less than the preset value in a cloudy or rainy environment, reset Insulation resistance protection.

2063

Cabinet Overtemperature

Minor

Cause ID=1

1. The inverter is installed in a place with poor ventilation.
2. The ambient temperature is too high.
3. The inverter is not working properly.

1. Check the ventilation and whether the ambient temperature of the inverter exceeds the upper limit. If the ventilation is poor or the ambient temperature is too high, improve ventilation.
2. If both the ventilation and ambient temperature meet requirements yet the fault persists, contact your dealer or Huawei technical support.

2064

Device Fault

Major

Cause ID = 1-5, 7-12, 20

A fault occurs on the internal inverter circuit.

• Cause ID = 1-5, 7-12

Turn off the AC output switch and then the DC input switches. After 5 minutes, turn them on in the same sequence. If the fault persists, contact technical support.

• Cause ID = 20

Do not turn off the AC output switch or DC input switch. Contact your dealer or technical support.

2065

Upgrade Failed or Software Version Unmatch

Minor

Cause ID=1

The upgrade does not complete normally.

1. Perform an upgrade again.
2. If the upgrade fails several times, contact your dealer.

2066

License Expired

Warning

Cause ID=1

1. The privilege license has entered the grace period.
2. The privilege feature will be invalid soon.

1. Apply for a new license.
2. Load a new license.

2086

External fan abnormal

Major

External fan short-circuited, power supply insufficient, or air channel blocked

Cause ID 1–3: fans 1–3

1. Shut down the fan, turn off the DC switch, check whether the fan blades are damaged, and clear the foreign matter around the fan.
2. Reinstall the fan, turn on the DC switch, and wait for the inverter to start. If the fault persists after 15 minutes, replace the external fan.

2087

Internal fan abnormal

Major

Cause ID=1

The internal fan is short-circuited, the power supply is insufficient, or the fan is damaged.

Turn off the AC output switch and then the DC input switch. Turn them on after 5 minutes and wait for the inverter to connect to the power grid. If the fault persists, contact your dealer or Huawei technical support.

2088

Abnormal DC protection unit

Major

• Cause ID = 1

  The fuse is not in position or is blown.

• Cause ID = 2

  The two relays on the breaking board are open-circuited.

• Cause ID = 3

  DC switch contact sticking.

• Cause ID = 1/2

  Turn off the AC output switch and DC input switch, and then turn them on after 5 minutes. Wait for the inverter to connect to the power grid. If the alarm persists after 5 minutes, contact your dealer or Huawei technical support.

• Cause ID = 3

  If the PV indicator (LED1) is off, contact your dealer or Huawei technical support to replace the device. If the PV indicator (LED1) is on, wait until the PV string current decreases to below 0.5 A. Then turn off the AC output switch and then the DC input switch. After 5 minutes, turn on the AC output switch and the DC input switch. Wait until the inverter connects to the power grid. If the fault persists 5 minutes later, contact your dealer or Huawei technical support.

2093

Abnormal DC Switches

Minor

Cause ID=1

The DC switch is not in the ON position, or the DC switch reset button is not pressed down to the bottom.

Check whether all DC switches are in the ON position. If not, turn the switches to the ON position (you can rotate the switches with force to ensure that they are in position). If the switches still cannot be turned to the ON position, press the reset buttons of all DC switches inwards until they cannot be moved further, and then turn on the DC switches again.

61440

Faulty Monitoring Unit

Minor

Cause ID=1

1. The flash memory is insufficient.
2. 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 or Huawei technical support.