Huawei SUN2000 alarm: where to find the code and what to do

Safety first

Don't open the inverter and don't touch cables or plugs. If you smell burning, see smoke or find the inverter very hot, step away and ask for help; if there is fire, call 112.

Where to find the code

• In the FusionSolar app, in the alarm list of the system or of the inverter, which shows the alarm number and name. The exact place depends on the app version.
• On the unit, the colour and state of the indicator lights. Photograph them without touching.
• On the side label, the full model, which starts with SUN2000. You need the model to read the right manual.

Where the maker's list is

Each alarm has a meaning and recommended actions that depend on the model and the equipment version. The full list is in the Huawei Inverter Alarm Reference, EDOC1100345192, Issue 14 and in the manuals for your model, on the Huawei support site.

That reference is shared across Huawei models and does not say which alarms each model can show. Always check the manual for your exact model or the FusionSolar app.

If the manual lists actions that need the equipment to be opened or measured with tools, those actions are not for the owner: don't do them.

Common alarms: what you can check

A summary, in our own words, of alarms in the Huawei Inverter Alarm Reference (EDOC1100345192, Issue 14). The names and numbers are the manufacturer's. The severity is as the manufacturer states it: Major means the inverter stops or loses functions; Minor means it keeps generating; Warning means it works with less output because of outside causes.

• 2032, Grid Failed (major): grid outage or the AC circuit is open. You can check whether there is a power cut in the area. If the AC breaker is off, don't simply switch it back on: ask for help.
• 2033, Grid Undervoltage (major): grid voltage below the limit. If it is occasional, the inverter recovers by itself. If it is frequent, it is a matter for the grid operator.
• 2034, Grid Overvoltage (major): grid voltage above the limit. Occasional ones clear by themselves; if frequent, talk to the grid operator.
• 2036, Grid overfrequency (major): grid frequency above the limit. Same rule: occasional clears; frequent, grid operator.
• 2037, Grid underfrequency (major): grid frequency below the limit. Same rule.
• 2051, Abnormal Residual Current (major): insulation resistance to ground dropped while the inverter was running. An occasional one clears by itself. If it repeats, ask for help: the measurement is installer work.
• 2063, Temperature High (minor): poor ventilation, heat or internal heat. You can look from outside to see whether anything covers the inverter or whether it is in direct sun, without touching it. If the site already meets the requirements, ask for help.

Alarms that are installer work

For these, the manufacturer's action involves the DC switch, connectors, insulation or the inside of the equipment. They are not for the owner: note the number, take a photo and ask for help.

• 2001, String Voltage High (major): panel string voltage above the inverter's maximum, due to the configuration. The installer checks the configuration.
• 2002, DC Arc Fault (major): arcing or poor contact in the panel cables. The installer inspects connectors and cables.
• 2011, String Reverse Connection (major): a string with reversed polarity. Only with the DC switch off and by trained people.
• 2015, PV String Loss (warning): a string is no longer detected. Connections at the inverter and at the panels, by an installer.
• 2016, String Short-Circuited (major): cable insulation failed or there is a short circuit. Do not touch the DC switch or connectors in sunlight.
• 2031, Phase wire short-circuited to PE (major): a phase conductor shorted to earth. Measurement by an electrician or installer.
• 2062, Low Insulation Resistance (major): panel string or battery with poor insulation to earth, often from damp. The inverter cannot start. The installer checks it.
• 2064, Device Abnormal (major): a major internal fault, or protection triggered by external factors. Don't switch anything on or reset it: contact the installer or the manufacturer.

What to send when you ask for help

• The full model, from the label.
• The alarm number and name, as shown.
• A photo of the lights and the display, if there is one.
• When it started, whether it repeats and whether there was a power cut or building work at home.

We reply within 48 h, assess the case remotely and, if needed, with a visit, and send a written quote with the price stated before you go ahead. See also the Huawei page and equipment repair.

About this information

These are general points and don't replace the manual for your model, which prevails. Huawei, SUN2000 and FusionSolar are trademarks of their respective owners. Sol de Volta is a company independent of the manufacturer and does not speak for the brand.