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Hi! My name is ***** ***** I can assist you with this. I may need some additional information from you first in order to give a complete answer.
That can be caused by several things. What is the complete model number of your genset?
I am at lunch right now and will be back at my shop in about an hour.
See the attached manual link for your set. That fault code is for low cranking speed and usually is caused by batteries that are either failing or just not fully charged. You said you only have 12.3 VDC and fully charged you should read at least 12.8 VDC. So that, or some dirty connections that result in lower voltage may be an issue. The other one can be several things and related to the first. Sometimes, when the on/off switch on that board is failing you can have this happen. Correct the first one and see if the second problem remains and then get back to me. Print out the manual if you don't aleady have it. Let me know what happens and we can go from there. All follow ups are included in our fee. https://coloradostandby.com/media/custom/upload/document_technical_983-0101.pdf
I will opt out of this and let our Onan tech offer something. He stays very busy and has a day job so be patient.