A fan at the electric distribution center

Markitect
Markitect Member Posts: 17
in Battery/Electrical & Solar


Quick question:
I plugged my trailer into a 20a circuit, using an adapter for the 30a plug for the trailer.
We hear the hum of a fan coming from the electrical distribution panel.
We've never heard this fan before,  even when connected to shore power, (though it's been a 30a service).
It's not particularly warm in the trailer...

We have the WFCO ULTRA III, WF-89 series 


Any thoughts?
Should we be worried?

Thanks in advance!
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