generator diagnostic
Generator surges or hunts
A guided diagnosis for a generator that runs but repeatedly revs up and down.
generator
Does the generator run but repeatedly rev up and down?
This diagnostic is for a running generator that cannot hold a steady RPM.
Before you begin
Shut the equipment down before inspecting it. Never bypass a safety switch, touch energized generator outlets, or inspect a moving blade, chain, auger, or pump.
Common questions
Why does my generator engine keep revving up and down?
Generator surging usually comes from stale fuel, a partially clogged carburetor, restricted fuel or airflow, or a governor that is constantly correcting engine speed.
Can generator surging damage appliances?
Yes. Unstable engine speed can produce unstable frequency or voltage. Disconnect sensitive loads and stop using the generator if lights flicker heavily or voltage appears unstable.
When should generator surging go to a professional?
Use a technician for unstable voltage, burning smells, exposed wiring, persistent governor problems, or surging that remains after fresh fuel and basic airflow checks.