Gen3 Inverter wont broadcast its SSID

Hi,
My Gen 3 Hybrid inverter drops its connection to my home wifi network and Ive been used to reconnecting it by multiple attempts via the usual method. Its never been easy and has generally taken 5 to 10 attempts after using the reset button on the HF-21 module.
On 5 Nov 24 it disconnected again but wont, whatever I do, broadcast its SSID so I can start the process of connecting to wifi.
Neither will it, after setting dipswitch number 1 to OFF and restarting the inverter, allow connection to my TP Link Extender, a metre away, via an ethernet cable. The cable is healthy.
My wifi network only operates at 2.4ghz. The TP Extenders in my home network each have their DHCP disabled.
My installer hasnt been very active in resolving the issue but GivEnergy Chat has raised a ticked and will look into it.
In the meantime, can anyone shed any light on this from direct experience?

GivEnergy raised a Ticket on 9 Nov 24 and the Installer visited on 14 Nov to check out the issue. It appears the HF-21 comms module in the Gen 3 Hybrid inverter is behaving very weirdly and it is likely that GivEnergy engineer is to visit to replace.
The only time the inverter would broadcast its SSID is when it is switched into its LAN mode via the dip switches. And even then, it would not connect to wifi or LAN via ethernet cable.