Critical What does this mean?

A safety-rated fault — there may be a risk of electric shock, fire, or equipment damage. Do not try to fix this yourself. Call a qualified electrician.

Solis Inverter ILeak-Pro Error: Meaning, Causes & Safe Fix

Your Solis inverter detected leakage current — electricity escaping where it shouldn't — and shut down as a safety protection. Do not touch the equipment; this needs a professional.

What should I do first?

Two quick questions — we'll point you to the right starting point.

Is this code still showing on your inverter's display?

What this code means

ILeak-PRO means 'leakage current protection' (variants 01–04 are escalating thresholds). Solis inverters continuously monitor for residual (leakage) current between the system and earth. If it exceeds the safety threshold, the inverter disconnects immediately. Leakage current can indicate damaged insulation or moisture — a potential shock hazard.

What is this downtime costing you?

Rough estimate while your system isn't producing. Adjust the numbers to match your setup.

System size (kW) Peak sun hours / day Electricity rate ($/kWh)

–per day

–per week

–per 30 days

≈ – kWh of lost production per day.

Estimate only — assumes ~80% real-world output vs. nameplate. Actual losses depend on weather, shading, panel direction, and your tariff.

Common causes

Damaged or damp DC cabling or connector insulation allowing current to leak to earth
Loose AC or DC connection
Faulty internal cable connection inside the inverter

Safe steps to try

Work top to bottom, ticking off each step as you complete it. 0 of 5 done.

Do not touch the inverter, its cables, or the mounting — treat it as a potential shock hazard
Note the exact code from the display without touching the unit
You may perform one documented restart (AC OFF, DC OFF, wait 5 minutes, DC ON, AC ON) only if everything looks and smells normal
If the code returns — or if you see damage, moisture, or smell burning — stop and call a professional
Keep children and pets away from the equipment until it has been checked

Is your inverter still under warranty?

Before paying for a repair, check — your installer may fix this free.

Brand Year installed

Based on typical standard warranty terms — always confirm with your warranty card or installer paperwork, as terms vary by model, region, and purchase date.

When to call an electrician

Call your installer or an electrician immediately. Leakage-current faults involve potential shock hazards and insulation testing that only a qualified professional with proper test equipment should perform. Never open the inverter.

Frequently asked questions

Is this dangerous?

Yes — leakage current means electricity may be finding an unintended path, which is a potential shock hazard. That's exactly why the inverter shut itself down.

Can I restart the inverter?

Only if everything looks, smells, and sounds completely normal — and only once. If the code returns, stop and call a professional.

Will my inverter be OK after this?

The protection worked as designed, so the inverter itself is likely fine. But the underlying leak must be found and fixed by a professional before normal operation resumes.

Need a professional?

This fault is a safety risk — do not attempt to fix it yourself. Contact a qualified solar electrician in your area.

Sources: meaning and troubleshooting verified against the manufacturer's documentation — Solis S5-GR3P(3-13)K Three Phase Inverter User Manual (Ginlong Solis), Table 9.1