On the covered Kohler standby generator, Engine Speed Low means shutdown. Engine speed dropped below 85% of normal running speed for more than 3 seconds. First, note which loads were running when the set slowed. Then: Kohler directs reducing the load and checking the enclosure thermostat, resetting it if tripped, then contacting an authorized dealer.
Differential
Likely causes of “Kohler standby generator code Engine Speed Low”, and how to tell them apart
- 1
Fuel starvation
What separates it The generator starts, loads up and shuts down as the engine slows
How to confirm A clogged fuel filter, a closed or empty LP tank valve or low line pressure cut the fuel the engine needs
- 2
A governor or linkage fault
What separates it The engine hunts up and down before it stops
How to confirm The governor holds engine speed, so a sticking or misadjusted linkage lets the speed fall
- 3
A load too large for the set
What separates it It fails after a big load starts, such as an air conditioner compressor
How to confirm Reduce the load, as Kohler advises, and restart
Try in this order
0 of 7 completedWhat to do first
ReversibleNote which loads were running when the set slowed.
Correct only the documented fault domain
ReversibleKohler directs reducing the load and checking the enclosure thermostat, resetting it if tripped, then contacting an authorized dealer.
Reduce the load
ReversibleSwitch off large loads and restart the generator. Kohler's first response to this fault is to reduce the load.
Check the fuel supply
ReversibleConfirm the LP or natural gas valve is open, the tank has fuel and the filter is clear.
Call the dealer
ReversibleIf it repeats with a light load, Kohler says to contact an authorized distributor or dealer for the governor check.
Read the fault history before you reset
ReversibleThe controller keeps the fault message after a shutdown. Write down the time and what the generator was carrying; a fault that appears only when a large motor starts is a load problem, one that appears on light load is fuel or governor.
Look at the air filter and the fuel lines
ReversibleKohler engines lose speed when starved of air as well as fuel. Inspect the air filter for clogging, check the fuel hose for kinks and confirm the LP regulator is not frosted or the natural gas supply valve is fully open.
Evidence ledger
Sources behind this answer
Exact questions
Common questions
What does Engine Speed Low mean on a Kohler standby generator?+
Shutdown. Engine speed dropped below 85% of normal running speed for more than 3 seconds.
Can a low battery cause Engine Speed Low on a Kohler generator?+
Not directly; a weak battery shows as a low cranking voltage fault. Engine Speed Low is about the engine slowing while it runs, which points to fuel, air, the governor or an overloaded set.
Is Engine Speed Low a fault I can fix myself?+
You can reduce the load and check the fuel valve and filters. A governor or linkage fault is for a Kohler dealer, which is what Kohler's own guidance says when the fault repeats on a light load.