Both on -- turns it on. Either one off -- turns it off.
Just to make sure I do not fry my heater element, I always turn off the water heater circuit breaker on the ac breaker panel -- probably overkill but it's what I do.
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2012 Passport GT 3100RK
Previous Campers:
2010 Trailmanor 2720SL
2003 R-Vision Traillite
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