Error codes differ between brands, but they fall into a handful of groups. Identifying the group tells you whether the problem is the grid, the solar array, the environment or the inverter itself.
Step 1: Record the exact error
Note the code, the time it appears and whether it clears on its own. Check the inverter manual or app for the description.
Step 2: Identify the error group
- Grid errors — voltage, frequency, no grid, anti-islanding
- DC / array errors — isolation, PV over-voltage, reverse polarity, string faults
- Temperature errors — over-temperature, fan fault
- Internal errors — relay check, DC bus, DSP, communication between boards
Step 3: Check the obvious
For grid errors, confirm the grid is present and stable. For DC errors after rain, wait for panels to dry — if the error persists, a cable or connector is likely damaged. For temperature errors, check ventilation and fan noise.
Step 4: Restart correctly
Switch off AC first, then DC, wait five minutes, then switch DC on followed by AC (or as per the manufacturer's manual). If an internal error returns immediately after restart, the inverter needs repair.
Step 5: Call a technician for internal errors
Relay, DC bus, DSP and hardware errors require test equipment and PCB-level skills. Don't keep resetting the inverter — repeated restarts on a damaged power stage can cause further damage.
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