Err 41
EcoFlow Portable Power Station
Severity: ModerateWhat it means
EcoFlow Err 41 means the internal AC inverter has reported a hardware fault — the circuit that converts the battery's DC to 230V (or 120V) AC has detected something wrong with itself.
All AC sockets disable; DC and USB usually keep working.
Err 41 sometimes clears on a full reset, but a repeating Err 41 is a service issue.
Affected Models
- EcoFlow DELTA / DELTA 2
- EcoFlow DELTA Max
- EcoFlow DELTA Pro
- EcoFlow RIVER Pro / RIVER 2 Pro
Common Causes
- Inrush from a high-startup-current appliance briefly faulted an inverter MOSFET
- Inverter overheated after sustained high-load use (especially if the unit was charging at the same time)
- Internal fuse on the AC stage opened
- Firmware glitch — usually fixed by a full power-cycle
- Hardware failure (capacitor, MOSFET) — service required
How to Fix It
-
Switch off the AC output.
Press the AC button on the front panel until the AC indicator goes dark.
This stops the inverter from immediately trying again on next power-up — which would just re-trip Err 41 if the fault is still there. -
Do a hard reset.
Hold the main power button for 8-10 seconds until the screen goes black.
Disconnect any wall charging cable.
Leave the unit alone for 5 minutes — enough time for thermal protection to release if heat was the cause.
Power back on with no AC load attached. -
Test the AC side with a small load.
Plug in something tiny — a phone charger or a small lamp — before plugging anything big in.
If the AC output runs that load cleanly for 10+ minutes, the inverter is functional and the original Err 41 was a one-off thermal event.
If Err 41 returns immediately, the inverter has a real fault. -
Check for firmware updates.
Connect the unit to the EcoFlow app over Bluetooth.
Firmware updates have specifically addressed false Err 41 trips on early DELTA 2 units.
Update if anything is available, then retest.
When to Call a Professional
If Err 41 returns within minutes of every restart, stop trying to use the AC side.
Contact EcoFlow support with the unit's serial number and your purchase date — units inside the 2-year warranty are typically repaired or swapped.
Don't open the case; it voids the warranty and there are unfused capacitors inside that hold dangerous charge.