I think this is the manual you were looking for. I found it on the Australian Vevor website. https://d2v0huudrf11kh.cloudfront.ne...4738270427.pdf I had exactly the same problem as you. I think it is a different VFD to the often linked to Huanjang VFD. This one has the PN prefix on its parameters. I checked the parameter PN33 which is set to 32u29 and from that decided it was the same VFD (HY023D223B)