Error E317 - Baxi Luna boiler is not working from the charging station

There is a Konner Sohnen KS 5200 PS charging station. The house has grounding. When connecting, the Baxi Luna shows error E317.

Let's read the instructions:

Let's read further. Baxi - wants 50Hz KS 5200 PS - provides 50Hz Google finds no information. AI says that the station does not provide pure 50Hz, and the boiler is very sensitive. It recommends installing a stabilizer that will equalize the frequency, sine wave, etc. Such stabilizers are not cheap and take up quite a bit of space. I have a bit of distrust towards AI. So before spending money - a bit more information search. I find information that the boiler does not ignite if there is no real neutral. This is not related to error E317. But it is worth taking a look at my electrical panel. I have a two-pole AVR that switches between City (A) and Charging Station (B). When the city is connected - the station charges (after the AVR). Here I saw that I had assembled a completely isolated network. When the AVR switches to the station - the neutral and phase from the city are cut off. So I reassembled the electrical panel a bit. I power the station from the city to the AVR. That is ALWAYS. If there is no power from the city - the neutral is still available. Also, the KS 5200 PS instructions state that it needs a grounded neutral. The electricians who did my grounding connected the ground to the neutral bus under the meter. So everything is fine here.

We test - and the boiler works. So the error E317 that Baxi was showing did not indicate exactly what was needed. And AI does not always suggest what is necessary.