When my genny shut down last summer under load, there was no error code.
For your heat related issue, are you sure it is a fuel delivery problem?
I saw that the specification from Onan for RV generators is a max operating temp of 120Deg F. Perhaps in Arizona, you are simply exceeding the operating parameters of the generator?
If that is the case, I might try something like an axillary cooling fan on the generator to keep it cooler.
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