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Hank F.
Hank F., Technician
Category: Small Engine
Satisfied Customers: 14675
Experience:  Certified on Onan and Generac generators
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My gen starts then dies in one second. Shows UU What should

Customer Question

My gen starts then dies in one second. Shows UU
What should be my response?
Submitted: 8 months ago.
Category: Small Engine
Expert:  Hank F. replied 8 months ago.

UU is Under Voltage. It means that the genset is not producing enough power.

The most likely cause is a bad voltage regulator, but full testing must be done to find out for sure.