I had a similar issue last night when I was washing my ACE 29.4, it started making a fast ticking sound, it sounded like the pilot had gone out and was trying to restart, also a fan was blowing. I took the access panel off and it didnt seem like there was any water inside and I was careful not to spray directly at the exhaust. It went on for quite awhile, I unplugged the power and switched the battery to store mode to shut it off, then waited a bit, the furnace started up normally after that but when I went to shut it down it made the same ticking sound for a couple of minutes, then stopped, very puzzling
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