Eazrider - My 2002 Horizon is a year older than yours so there is a good chance they have the same HWH system, mine has the HWH 310 series.
When I want to dump the air I turn the ignition switch to “ACCESSORY”, then push the “ON” button on the touch panel, the air will then exhaust from the suspension air bags. When the air is completely exhausted I can begin to level.
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I'm Jammin
02 Itasca Horizon 36LD, Cat 3126E, Allison MD3000MH
09 Colorado Z71 Ex Cab, SMI AF1, Demco Base Plate & Tow Bar.
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