Looking at your coach's layout with the power center and CONVERTER located in the same vicinity as the furnace I really think it was the CONVERTER fan you heard. Although you may not be able to reproduce it with just turning on the cabin lights (depends on the state of battery charging occurring) if you turn on all the lights in the coach it should trigger the fan to come on.
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Ted & Melinda
2016 ACE 27.1
2016 Chevy Sonic Toad - Selling
2020 Chevy Colorado Z71 Trail Runner Toad
2024 Chevrolet Trax 2RS - Soon 2B TOAD
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