On the covered Kohler standby generator, Spd Sens Flt means shutdown. The engine speed sensor has failed, or the engine stalled. First, record whether the engine was running or cranking. Then: contact an authorized dealer for service.
Try in this order
0 of 8 completedWhat to do first
ReversibleRecord whether the engine was running or cranking.
Correct only the documented fault domain
ReversibleContact an authorized dealer for service.
Treat it as a sensor or wiring fault
ReversibleThe controller raises a speed sensor warning when the speed signal is absent for one second while the set runs. The sensor and its connector are what a dealer checks.
Have the speed sensor checked
ReversibleThe speed sensor reports how fast the engine turns to the controller. A loose connector, a damaged lead or a failed sensor all make the signal vanish, and a dealer can test each.
Check the generator's oil and fuel first
ReversibleA speed-sensor alarm can appear when the engine is running badly, so rule out low fuel pressure and a low oil level before suspecting the sensor.
Look at the sensor connector
ReversibleWith the generator switched off at the controller and the battery disconnected, look for a loose or corroded connector at the speed sensor and a wire that has rubbed through.
Test a short manual run
ReversibleReconnect the battery, start the set in RUN with no load and watch whether the alarm returns at once or only under load.
Book a technician
ReversibleA sensor, its gap and the wiring need to be measured with the right tools, so a Kohler technician should replace or adjust them.
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Exact questions
Common questions about “Kohler standby generator code Spd Sens Flt”
What does Spd Sens Flt mean on a Kohler standby generator?+
Shutdown. The engine speed sensor has failed, or the engine stalled.
Will the generator keep running with a speed sensor fault?+
The controller issues a warning when the signal is lost for one second while running. Have it checked before the next outage.
What is the speed sensor on a Kohler generator?+
It tells the controller how fast the engine is turning. A fault in its signal or wiring makes the controller unable to confirm engine speed, so it can stop the set to protect it.
Can I clear Speed Sensor Fault myself?+
You can acknowledge the alarm, but a fault that returns means the sensor, its connector or the wiring needs a technician's attention, since the engine cannot be trusted to run without a speed reading.
Does the battery affect a speed sensor alarm?+
A weak battery can make the controller misread signals while cranking, so check the battery voltage and the connections before replacing the sensor.
Will a Kohler generator start with a speed sensor fault?+
It may crank but shut down again, because the controller cannot confirm the engine speed. A set with this fault should not be relied on during an outage until it is fixed.
Does Speed Sensor Fault mean the engine is damaged?+
No. It means the controller is not getting a reliable speed signal. The cause is usually the sensor, its gap or its wiring, but a technician should confirm it.
Can the generator run in an outage with this fault?+
It may start, but the controller can shut it down if it cannot confirm speed, so plan for it not to carry the house until it is repaired.