Try resetting the EMS board - this sometimes corrects a malfunctioning EMS. You do this by removing its 12v power for about 10-15 seconds. In many coaches this can be done simply by switching the battery disconnect to off. That works if the EMS gets its power from a source controlled by the disconnect. Some do not and are powered direct off a battery. In that case, you would have to actually disconnect the wire.
2004 American Tradition; 2014 Buick LaCRosse
Homebase in the Ocala Nat'l Forest near Ocala, FL