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.
Growatt Inverter Error 411 — When DSP and M3 Boards Stop Talking
Error 411 (“DSP communicates with M3 abnormal”) means the two internal processors in your Growatt MIN TL-X series inverter have lost their communication link with each other. The inverter cannot convert power safely without that internal link, so it shuts down. One orderly restart often clears a transient glitch. If 411 comes back, Growatt’s official remedy escalates in a fixed order — restart, then a DSP and M3 firmware update, then replacement of the DSP or M3 board — and everything past the restart is a job for your installer or Growatt 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?
Is your system producing power right now?
What this code means
Inside your Growatt there are effectively two brains. The DSP (digital signal processor) runs the power conversion — switching, MPPT tracking, grid synchronisation. The M3 (an ARM Cortex-M3 microcontroller) handles monitoring, communications, and a redundant set of measurements that double-check the DSP’s work. The two chips exchange data constantly, and the inverter will only operate while that conversation is healthy.
Error 411 is the flag for the conversation breaking down: the DSP and the M3 can no longer hear each other. It is different from the neighbouring codes 417 and 422, which mean the two processors are talking but their measurement data disagrees — 411 is the more fundamental failure, a dead link rather than a disagreement. Without the link, the inverter has no verified picture of what the power stage is doing, so the only safe response is to stop.
That sounds dramatic, but the design intent is reassuring: the inverter would rather produce nothing than produce power it cannot verify. Nothing about 411 suggests your panels, your battery, or your home wiring are at fault — it is an internal electronics matter from start to finish, which is also why the homeowner’s role in fixing it ends at the restart.
What is this downtime costing you?
Rough estimate while your system isn't producing. Adjust the numbers to match your setup.
≈ – 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 transient firmware crash or single-event glitch — the most common cause, and the reason the manual’s first step is simply to restart.
- Mismatched DSP and M3 firmware versions — after a partial or interrupted update, the two processors can end up speaking different protocol versions and fail to link.
- A loose internal board connector — heat cycling and vibration over years can work a ribbon or board-to-board connector loose.
- A failing DSP board or M3 board — if the link never re-establishes, one of the two boards has a hardware fault and Growatt treats it as a replacement job.
- Residual damage from a severe electrical event — a nearby lightning strike or major grid surge can injure internal electronics; the link failure is then a symptom, not the disease.
Safe steps to try
Work top to bottom, ticking off each step as you complete it. 0 of 5 done.
Is your inverter still under warranty?
Before paying for a repair, check — your installer may fix this free.
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
The second occurrence of 411 is your signal to call for service — do not keep restarting a unit whose internal processors cannot stay linked. Growatt’s official remedy sequence is explicit: restart the inverter; if the problem persists, update the DSP and M3 firmware; if it still persists, change the DSP board or the M3 board; then contact Growatt. Firmware updates on these boards and any board replacement must be done by qualified service personnel with the correct firmware files — a wrong or interrupted flash can leave the inverter worse off. If the unit is under warranty, log every occurrence with dates before you call; a documented pattern speeds up the replacement decision.
Frequently asked questions
Is my solar system damaged?
No — 411 is the inverter failing safe. Your panels and wiring are almost certainly fine; the fault is confined to the inverter’s internal control electronics.
What’s the difference between 411, 417 and 422?
411 means the DSP and M3 processors cannot communicate at all. 417 and 422 mean they are communicating but the data they exchange doesn’t match. All three stop the inverter, but they point the technician at different faults — a dead link versus a measurement disagreement.
Can I update the DSP/M3 firmware myself?
No. The firmware files and the update procedure are service-only, and the manual places the update step after the restart precisely because it needs qualified hands. Ask your installer.
The inverter worked for a week after the restart, then 411 came back. What does that mean?
An intermittent link — often a connector working loose with heat or a board fault developing. It still needs service; intermittent internal faults don’t heal.
Am I losing my feed-in payments while this shows?
Production is stopped while the fault is active, so yes, generation is lost for the duration. That’s another reason not to sit on a recurring 411 — get it serviced.
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 — Growatt MIN 7000TL-X User Manual, §11.4 Inverter fault — “Error: 411 — DSP communicates with M3 abnormal. Restart inverter, if problem still exist, contact Growatt.”; Growatt MIN 7000-10000TL-X2 User Manual, §11.4 — remedy: “1. Restart inverter, if problem still exist, update the DSP&M3 firmware; 2. Change DSP board or M3 board, if problem still exist, contact Growatt.”