Early last year, I changed the oil, filter, air filter, fuel filter, and antifreeze on our Onan 8000QD. Then late last year, the generator would quit and show the same code, 33. I did the same thing you did, but that did not solve the problem. So, I opened the radiator fill cap, which is under a plate, and realized that the radiator was low on fluid. So I added fluid until full, and restarted the generator. It ran like a top. I learned that the radiator needed to be "burped" after changing the antifreeze.
Be sure to check the fluid in the radiator itself along with the fluid in the overflow tank.
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May your smiles be many and the miles be plenty.
Karen & Allen Van Zandt
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