Wifi connection to 2.4 GHz don't work (5GHz do)

Configuration
1

Hello everybody
I have home assistant installed on a Pi 4
my setup is

  • Installation methodHome Assistant OS
  • Core2025.7.1
  • Supervisor2025.06.2
  • Operating System15.2
  • Frontend 20250702.1

I use a cable connection to my router and it works, I can access HA both from internal net and from nabucasa

Then I use wifi (wlan0) to connect to my huawei inverter wifi via its 2.4Ghz.
The inverter is a SUN2000-6KTL-L1 with V200R001C00SPC147 firmware.
By this connection I can use the Huawei solar integration

Until recend days all was working fine but at some point the integration stopped working.
After some search I found that the wifi connection to the inverter was down
I tried to connect to it many times and it wasn’t possible, i got an error saying:

“Failed to change network settings
Activating connection failed, check connection settings.”

Then I tried to use the terminal way to connect it:

ha network update wlan0 --ipv4-method auto --ipv6-method disabled --wifi-auth wpa-psk --wifi-mode infrastructure --wifi-ssid ‘SUN2000-xxxxxxxxx’ --wifi-psk mypassword

No way to connect.
Then I reinstalled HaOS and loaded a recent backup.
After some attempt both from UI and terminal the connection started to work and the integration too.

Today, after a grid outage, again the connection to the inverter is down
But also any connection to a 2.4GHz wifi don’t work
My router has a 5GHz wifi (with its ssid) and a 2.4GHz with another ssid
The connection to the 5GHz works, but not the 2.4GHz…

I tried with raspberry pi OS on a SD card on this Pi4 and everything works (any connection, inverter included).

What the hell is going on?

The Pi is inside an Argon One case with M2 sata SSD, I read around that this case can make interference with 2.4GHz.
But why this works with Raspberry Pi OS?
Thanks for any help

2

the Argon One M.2 case is aluminum, can cause Interference with you wifi.
2.4ghz is much weaker that 5ghz

is been discussed here

Argon40 have at least accepted their mistake, fixed it in a revised design and customers contacting customer support will get you a replacement. No debate about if it’s a problem or not, just owning it and doing the right thing. It’s what I’d want to see from any company.

hasOS and PiOS are different network manager, one use wpa_suplicant and the other NMCLI

1 Like
3

Yes I see…
I detached the m2 board from argon and connected with a usb3 cable at 30cm distance.
All started working again.
I must investigate why my fan is always on, with 42C…
May be that can cause interference that together with the M2 board can brake my wlan power.

4

Will this add-on help? For me, the add-on monitors the fan and temperature perfectly.

5

I found the I2C not available and the argon one addon didn’t work so the fan was all the time @100%
I went through the I2C enabling process and the addon started to work. Now the fan is off (39C) and the 2.4GHz connection work also with the M2 board in its place…
May be the fan was the real problem.