Aggravating air pressure alarm
Had the exact situation in my 04 Windsor. Once it went off for 30 minutes as we left on a trip. Watching the gauges the alamr made no sense. Turns out, at least on my coach, that the air pressure switch at the back of the "parking brake" was defective. Replaced it and have been alarm free. Now works as it should. Take a look and see if that is your problem. Happy RVing.
Paul & Linda Lonnquist
Grants Pass, OR
06 Alpine 34FDDS/'10 Ford Fusion Hybrid