dovpear

Today the mosfets arrived, it was worth waiting 7 days. I didn't install the fuses on the PV side, I don't know why they blew up so I'll let it go for now. Tomorrow I will test when the sun shines, 230V works again and the error disappeared, nothing but mosfets was damaged. Resistors and control are all working.

Check the resistors on the gate of those IGBTs. Do you have an oscilliscope to check the driver circuits?

The bus softstart circuit might also be damaged, a quick check would be if the MOSFET driving the primary of TX2 is short circuit.

I use a high voltage IGBT/transistor/LED tester on the IGBTs from the DC-DC circuit to the H-bridge. I have had some pass the basic multimeter test but their break down voltage is out of specification when tested. It's saved expensive failures of replaced parts. See below of failure vs pass. (it's also very handy for checking zener diodes). It was USD20 odd from Aliexpress. EEVblog forum has some technical discussion on it here https://www.eevblog.com/forum/reviews/completely-non-sketchy-mini-high-voltage-transistor-tester-(emeco)/