Have you tried disconnecting from shore power, turning off all appliances and then starting the generator to see if it is now working correctly? You may not
be able to run the A/C and the microwave at the same time, if the generator is also charging the batteries. If the generator shuts down when you turn the A/C on, there will be a flashing code on the generator that may give you a clue to what is going wrong. If it just shuts down with nothing on, you still will get the code.
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