Huawei Error 2035: Grid Overfrequency Troubleshooting Guide

Huawei Error 2035 (Grid Overfrequency) indicates that the inverter has detected a grid frequency higher than the permitted operating range and has disconnected from the utility grid for protection and compliance reasons.

This is a grid-related protection event and does not usually indicate an internal inverter failure.

What Is Grid Overfrequency?

Grid frequency represents the balance between electricity generation and consumption within the power network.

In most European countries, the nominal grid frequency is:

• 50 Hz

Huawei SUN2000 inverters continuously monitor grid frequency and must disconnect if the frequency exceeds the limits defined by local grid codes.

When the frequency becomes too high, the inverter displays Error 2035 – Grid Overfrequency and stops exporting power.

Common Symptoms of Huawei Error 2035

When this alarm occurs, you may notice:

• Inverter stops producing power
• Solar generation suddenly drops to zero
• Grid Overfrequency alarm appears
• FusionSolar displays a grid fault warning
• Frequent inverter reconnection attempts
• Production resumes automatically after some time

In many cases, the inverter reconnects automatically once grid frequency returns to normal.

Why Huawei Error 2035 Happens

1. Utility Grid Frequency Too High

The most common cause is a temporary increase in utility grid frequency.

This can occur when:

• Electricity generation exceeds demand
• Large industrial loads disconnect suddenly
• Grid balancing events occur
• Utility switching operations take place

Typical frequency limits depend on local regulations and inverter settings.

Example:

• Nominal frequency: 50 Hz
• Normal operating range: approximately 49.5–50.5 Hz
• Protection threshold: typically around 51–52 Hz

Values vary depending on country code and grid standard.

2.Incorrect Grid Code Configuration

Huawei inverters use country-specific grid profiles.

If the wrong grid code is selected:

• Frequency protection limits may be incorrect
• The inverter may disconnect unnecessarily
• Grid alarms may occur even when the utility frequency is acceptable

3. Frequency Measurement Errors

Although less common, incorrect measurements can occur because of:

• Wiring problems
• Loose AC connections
• Voltage quality disturbances
• Electrical noise

These issues may cause the inverter to detect abnormal frequency values.

4. Utility Grid Disturbances

Temporary events within the distribution network can trigger frequency excursions:

• Grid switching operations
• Generator synchronization events
• Transmission faults
• Regional grid instability

These events are usually short in duration.

How to Diagnose Huawei Error 2035

Step 1 – Check When the Alarm Occurs

Ask the following questions:

• Does the alarm occur at the same time every day?
• Does it happen only occasionally?
• Are nearby installations experiencing similar issues?

Patterns often help identify utility-related problems.

Step 2 – Review FusionSolar Event Logs

Check:

• Alarm timestamps
• Alarm frequency
• Reconnection behavior

Repeated occurrences may indicate a persistent grid condition.

Step 3 – Measure Grid Frequency

Using a calibrated power quality meter, verify:

• Frequency at the main distribution board
• Frequency at inverter terminals

Normal European grid frequency should remain close to 50 Hz.

Step 4 – Verify Grid Code Settings

Confirm:

• Country selection
• Grid standard configuration
• Utility requirements

Incorrect settings can trigger unnecessary frequency alarms.

Typical Frequency Limits

Reference values vary by country and utility requirements.

Typical examples:

Parameter	Value
Nominal Frequency	50 Hz
Normal Operating Range	49.5–50.5 Hz
Overfrequency Protection	~51–52 Hz
Underfrequency Protection	~47.5–49 Hz

Always verify the applicable limits for the installed grid code.

Real-World Example

A commercial PV system experienced repeated Huawei Error 2035 alarms during periods of low electricity demand.

Investigation showed that local grid frequency occasionally exceeded the configured protection threshold because of generation-load imbalance within the distribution network.

No inverter fault was found.

After coordination with the utility provider, the frequency excursions were confirmed and the system continued operating normally when grid conditions stabilized.

Huawei Error 2035 vs Huawei Error 2032

These alarms are often confused.

Huawei Error 2035

• Frequency too high
• Grid remains present
• Frequency exceeds limits

Huawei Error 2032

• General grid abnormal condition
• May involve voltage, frequency, or grid instability
• Broader protection category

Accurate diagnosis requires reviewing event logs and electrical measurements.

Prevention Tips

To reduce frequency-related alarms:

• Verify correct grid code configuration
• Inspect AC wiring and connections
• Maintain firmware compatibility
• Monitor grid quality periodically
• Investigate repeated frequency events

Frequently Asked Questions

What does Huawei Error 2035 mean?

Huawei Error 2035 indicates that grid frequency has exceeded the allowed operating limit and the inverter has disconnected from the utility network.

Is Huawei Error 2035 dangerous?

No. It is a protective shutdown designed to comply with grid regulations and protect system stability.

Can Error 2035 damage the inverter?

No. The inverter disconnects specifically to prevent unsafe operation.

Will the inverter reconnect automatically?

Yes. In most cases, the inverter automatically reconnects once grid frequency returns to an acceptable range.

Is Error 2035 caused by the inverter?

Usually not. Most cases are related to utility grid conditions, configuration issues, or temporary network disturbances.

Related Huawei Troubleshooting Guides

👉 Huawei Error Codes Guide

👉 Huawei SUN2000 Error Code Index

Conclusion

Huawei Error 2035 (Grid Overfrequency) occurs when the inverter detects a grid frequency above the permitted operating range.

Most cases are caused by utility grid conditions, incorrect grid settings, or temporary network disturbances rather than inverter hardware faults.

Proper diagnosis should focus on frequency measurements, event log analysis, and verification of the configured grid code before assuming equipment failure.