Solis inverter alarm code: what it means and what to do

Safety first

Don't open the inverter, don't touch cables or plugs and don't turn any switch on the equipment. 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

• On the inverter display or in the monitoring app, in the alarm list, which shows the code and the alarm name.
• On the side label, the full model. You need the model to read the right manual.
• Photograph the display and the lights without touching.

Where the maker's list is

The codes below are summed up, in our own words, from the Solis alarm code list, last modified 2025-04-25. The numbers and names are the manufacturer's.

The list gives what each code means, not the actions to take, and some codes are shared by different faults, for example 1020. What applies depends on the model: always check the manual for your exact model.

Grid and temperature codes: what you can check

These codes point to the electricity grid or to where the inverter is. If one shows once and goes away, the inverter usually comes back by itself. If it repeats, ask for help.

• 1010, OV-G-V 01: grid voltage went above the first limit for some time. If it is frequent, it is a matter for the grid operator and for the installer, who checks the connections and the grid standard that is set.
• 1011, UN-G-V: grid voltage below the limit.
• 1012, OV-G-F: grid frequency above the limit.
• 1013, UN-G-F: grid frequency below the limit.
• 1015, NO-Grid: the inverter does not detect the grid. You can check whether there is a power cut at home or in the area. If the solar breaker is off, don't simply switch it back on: ask for help.
• 1032, OV-TEM: internal temperature too high. You can look from outside to see whether anything covers the inverter or whether it is in direct sun, without touching it.
• 103A, UN-TEM: ambient temperature too low. It usually clears as the air warms up.

Codes that are installer work

For these, the cause may be in the panels, the cables, the insulation or inside the equipment. They are not for the owner: note the code, take a photo and ask for help.

• 1020, OV-DC: panel input voltage above the limit. The same number is also used for another fault, depending on the model.
• 1028, Reve-DC: panel input connected with reversed polarity. Only by trained people.
• 1033, PV ISO-PRO 01: low panel insulation resistance. Damp is one possible cause. The measurement is installer work.
• 1034, ILeak-PRO 01: the leakage current protection tripped. Ask for an assessment.
• 1041, ARC-FAULT: an arc was detected on the panel side. Don't touch the DC switch or connectors: ask for help.
• 1048, IGBT-OV-I: overcurrent in the inverter's power components. Don't reset anything: ask for help.
• F017, L&PE FAULT: low resistance between the live wire and earth. Measurement by an electrician or installer.

What to send when you ask for help

• The full model, from the label.
• The code and alarm name, as shown.
• A photo of the display and the lights.
• 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 Solis page and equipment repair.

About this information

These are general points and don't replace the manual for your model, which prevails. Changing inverter settings, such as the grid standard, is installer work. Solis is a trademark of its owner. Sol de Volta is a company independent of the manufacturer and does not speak for the brand.