Generac model 43901 15,000 watts makes a buzzing noise when I try to start it. the engine doesn't turnover just makes a buzzing sound or similar to a buzzing sound
I had a similar problem and it was because I had OVERFILLED the oil! I drained enough to make sure it was within the crosshatched markings on the dipstick and it started right up.
SOURCE: I have a Generac portable generator 5000 watts, won't start!
I am assuming the generator worked fine before the oil change. Now that you have done the oil change the genset does not start. These generators have a safety switch, which is basically an oil pressure switch that keeps the engine from running when there is not enough oil in the engine. Make sure that there is enough oil and if there is, look for a wire that runs along side of the engine to a round component. disconnect that wire and try starting. If it does not start then try to ground out the wire to the engine block. If this does not work, then there is other engine problems.
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