13.4 VDC is appropriate output for the WFCO converter in "maintain mode".
The fan is directly linked to the amperage output (not voltage output) of the converter. If there is a significant load on the converter (lights, furnace motor, landing gear use, extended slide motor use) that draws increased amperage (not voltage) or that discharges the batteries and calls for "increased recharging capacity" (amperage increase) then the fan will come on to cool the transformers in the converter as they provide more amperage and heat up. The fan is "amperage driven" and will increase in speed as the amperage demand increases to the converter.
ADDED: In past years, most of the overhead lighting in RV's was incandescent bulbs. One incandescent bulb can draw as much amperage as 10 or 20 LED elements, so in the past, turning on two or three overhead lights would "trigger the converter fan". In today's RV's, with LED lights, you may not notice the fan in the converter until nearly every LED light in the trailer is turned on and maybe, even then, the fan won't be noticeable.
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John
2015 F250 6.7l 4x4
2014 Cougar X Lite 27RKS
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