Warning What does this mean?

Your system is down or running degraded, but this is not an immediate safety danger. Work through the safe steps below.

SolarEdge Inverter Error 18XA6: Meaning, Causes & Safe Fix

Internal hardware error — the inverter's self-diagnostics found a fault inside the unit. Try one full power cycle; if the code returns, the inverter needs professional service.

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

The inverter has detected an internal hardware fault during its self-checks. These codes (2x10, 2x95 on single-phase CPU v3.19xx firmware; 18xA6 on newer single-phase displays) all map to the same 'Hardware Error' condition in SolarEdge's official error table. The inverter shuts down production as a protective measure. The manual gives no homeowner-serviceable cause — it directs you to SolarEdge support.

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

Internal electronic component failure (the manual lists no specific cause — it is a general hardware fault flag)
Failed internal self-test after a firmware update or power event
Damage from a grid surge or lightning event

Safe steps to try

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

Write down the exact code, the time it appeared, and your inverter's serial number (on the rating label).
Perform one full power cycle: switch the red P/1/0 switch to OFF, wait until the DC voltage drops below 50V (or wait 5 minutes), switch the DC disconnect OFF, switch the AC breaker OFF, wait 2 minutes, then switch everything back ON in reverse order (AC first, then DC, then P/1/0 to ON).
Wait for the inverter to complete its start-up sequence (a few minutes in daylight).
If the code clears, monitor the system for 24 hours — note if it returns and when.
Do not open the inverter casing or attempt any internal checks.

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

If the code reappears after one full power cycle, stop and contact your installer or SolarEdge support with the code and serial number. Internal hardware faults are not homeowner-serviceable and may need a warranty replacement (SolarEdge inverters carry a 12-year standard warranty).

Frequently asked questions

Will restarting the inverter fix a hardware error?

Sometimes — a one-off self-test failure can clear with a full power cycle. But if the code comes back, the fault is real and needs professional service. Don't keep restarting it.

Is my solar system safe with this error showing?

Yes — the inverter has shut itself down as a protective measure. Don't touch the unit or any wiring; just record the code and call your installer.

Is a hardware error covered by warranty?

SolarEdge inverters come with a 12-year standard warranty (extendable to 20 or 25 years). Your installer or SolarEdge support can confirm coverage using your serial number.

Need a professional?

This fault may need professional diagnosis. Contact a qualified solar electrician in your area.

Sources: meaning and troubleshooting verified against the manufacturer's documentation — Troubleshooting SolarEdge Systems, Addendum (Europe & APAC), MAN-01-00333-1.1 — Hardware Error row (single-phase CPU v3.19xx: 2x10, 2x95; troubleshooting: 'Contact SolarEdge Support'). Also: Single Phase Inverter with HD-Wave Technology Installation Guide, MAN-01-00306-1.1, Appendix A (errors 166-168 → 18xA6-A8: 'HW error. Contact SolarEdge support.').