I can imagine that water in the air conditioner would cause the problem. Another, more common culprit, is a blown electric element in the water heater - but that doesn't match your circumstances. I would take the roof cover off the airco and let the sun and wind dry it out. You might also take off the cover off the inside of the airco and see if you can spot any water in there. Yes, the airco is exposed to rain and wind as you travel, so you would think that water can't get in from outside no matter what. But perhaps your hose or your brush pushed some into an area that is normally not accessible.
Bill
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