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.

Fronius Inverter STATE 461 — What a DSP Memory Fault Means

STATE 461 means your Fronius inverter has detected a fault in the data memory of its DSP — the digital signal processor that runs the power-conversion electronics. This is an internal fault that Fronius assigns to a trained service technician: if the code stays on the display, your installer needs to handle it.

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

Every Fronius SnapInverter has a DSP — a digital signal processor, the dedicated chip that switches the power electronics thousands of times per second to turn your panels' DC into grid-ready AC. To do its job, the DSP keeps working data in its own memory. STATE 461 is the inverter telling you that this memory failed an internal check. Think of it the way a computer behaves when it can't trust its own RAM: the safest thing it can do is stop and report the problem rather than keep running on bad data. Fronius lists 461 as a Class 4 status code and states that some Class 4 codes 'necessitate intervention by a Fronius-trained service technician.' There is nothing in the manual for you to adjust or repair yourself: the fault is inside the sealed electronics. That is why the remedy column for 461 is a single instruction — if the code is displayed all the time, notify a Fronius-trained service technician.

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

["A failed memory self-check at startup. Inverters run internal self-tests every time they power up; an occasional glitch can trip one and then clear at the next start. (Documented behavior for the neighboring 'memory error' code 451 is that the inverter automatically attempts to reconnect; 461 carries no such statement.)", "Corrupted settings data after a power outage, grid event, or interrupted firmware update. The DSP's memory holds live operating values, and a bad write can fail the integrity check.", 'Aging or failing control-board electronics, more likely on older inverters that have endured years of heat cycles.', 'A knock-on reading from a different internal fault. If 461 appears alongside other Class 4 codes, the real problem may sit elsewhere on the board — note every code shown.']

Safe steps to try

Work top to bottom, ticking off each step as you complete it. 0 of 1 done.

["Record the code. Photograph the display (or write down 'STATE 461' plus the date and time) and note any other codes showing alongside it — your technician will want all of this.", "Check whether the inverter is still feeding. Look at the NOW values on the display or in Solar.web. If it's producing normally and 461 came and went on its own, it was likely a one-off self-check failure — still worth mentioning to your installer.", 'Do one documented AC restart: switch off the AC circuit breaker for the inverter, wait about five minutes, then switch it back on. This is the restart procedure Fronius documents for its status codes.', 'Do a safe visual check from the outside only: ventilation openings clear, no water around the unit, no burning smell or unusual heat. Never open the inverter casing.', 'If STATE 461 is still displayed after the restart — or keeps coming back — stop there and call your installer or a Fronius-trained service technician. Everything beyond this point is internal work.']

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 a professional when any of these is true: the code is still displayed after one AC restart; 461 returns repeatedly, even if the inverter seems to work between appearances; the inverter stops feeding energy into the grid while 461 is shown; or 461 appears together with other Class 4 codes. Call immediately — don't wait for a restart — if you notice a burning smell, smoke, or unusual heat from the unit. Fronius is explicit on this one: a persistent 461 is a job for a trained service technician, not a homeowner fix.

Frequently asked questions

Can I reset STATE 461 myself?

You can try the one documented AC restart described above. If the code clears and doesn't come back, it was probably a one-off self-check failure — still mention it to your installer at the next service. If it stays on the display, no: the fault is inside the sealed electronics, and Fronius reserves it for a trained service technician. Opening the inverter yourself risks electric shock and voids the warranty.

Will STATE 461 damage my solar panels?

No. The fault is in the inverter's own control memory, not in your array. Your panels are passive components and are unaffected. The realistic cost of ignoring the code is lost production while the inverter sits in fault — not damage to the rest of the system.

Does STATE 461 mean my inverter needs replacing?

Not necessarily. Only a technician with access to the internal diagnostics can tell whether it's a one-off glitch, a firmware issue, or a failing board. Many internal faults are fixed with a firmware update or a board swap — replacing the whole unit is the last resort, not the first step.

How quickly do I need to act on this?

If the inverter is still feeding energy and 461 appeared once and cleared, note it and carry on, then tell your installer. If the code is constant, keeps returning, or the inverter has stopped feeding, treat it as a same-week call — every day in fault is a day of lost production. It only becomes urgent if you notice heat, smoke, or a burning smell; then power down via the documented procedure and call immediately.

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 — Fronius Symo Advanced Operating Instructions (manuals.fronius.com/html/4204260426/en.html), Class 4 status codes table: 461 = 'DSP data memory error'; manual states 'Some of the class 4 status codes necessitate intervention by a Fronius-trained service technician'; remedy footnote: 'If the status code is displayed all the time: notify a Fronius-trained service technician.' Causes note: the manual lists no external causes for 461 — the possibilities in this article are framed as installer-checked possibilities, not manufacturer statements.