On the covered Kohler standby generator, ATS PhaseRot means warning. Transfer-switch phase rotation does not match, so the ATS will not transfer. First, do not attempt to force a transfer. Then: Kohler directs correcting the ATS connection using the ATS installation manual, wiring diagrams and the labels on the transfer switch.
Try in this order
0 of 3 completedWhat to do first
ReversibleDo not attempt to force a transfer.
Correct only the documented fault domain
ReversibleKohler directs correcting the ATS connection using the ATS installation manual, wiring diagrams and the labels on the transfer switch.
Correct the transfer switch connection
ReversibleA phase rotation mismatch means the ATS will not transfer. Kohler's documentation says to correct the ATS connection, following the transfer switch installation manual, its wiring diagrams and labels.
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Common questions about “Kohler standby generator code ATS PhaseRot”
What does ATS PhaseRot mean on a Kohler standby generator?+
Warning. Transfer-switch phase rotation does not match, so the ATS will not transfer.
Why won't my transfer switch switch to the generator?+
ATS PhaseRot is one reason: the phase rotation of the transfer switch does not match, so it will not transfer until it is corrected.
Is ATS PhaseRot a wiring problem?+
It is a phase rotation mismatch between the transfer switch and the source, corrected at the ATS connection by an electrician following the installation manual.
Who fixes an ATS phase rotation mismatch?+
An electrician or the dealer who installed the transfer switch, because it is corrected at the switch's wiring rather than on the generator itself.
What does phase rotation mean on a transfer switch?+
It is the order in which the three phases arrive. If the generator side and the utility side are wired in a different order, the switch will not transfer, to protect the equipment.
Can I swap two wires to correct the rotation?+
That is a wiring change to the transfer switch or the generator, so it needs a qualified electrician or the installer, working from the installation manual and wiring diagram.