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Author Topic: One of my AC unit will not work when connected to shore all work on generator  (Read 310 times)


  • Posts: 2
Have three AC units on Class A American Tradition.  My middle AC does not work on shore power.  All three work on Generator.

Gary RV_Wizard

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Well that's strange. The a/c units in your coach don't know the difference between genset and shore power, so something weird must be happening.  I'm pretty sure your coach has an EMS that manages power loads when connected to only 30A shore power.  It may have mistakenly "shed" (dropped out) the mid a/c unit.  It turns itself off when the genset runs, but stays active if it thinks it is using 30A shore power.  Try turning off the main battery disconnect for 20 seconds. That should reset the EMS and might bring the a/c back on.
Gary Brinck
Summers: Black Mountain, NC
Home: Ocala National Forest, FL


  • Posts: 2
Thanks! That worked! I was having some issues about a week ago with that units breaker triping so we replaced the breaker and then this happened. So thanks!