WFCO converter's fan work, not on a thermostat, but on the current supplied. So if the charger is supplying 12 volts to appliances or to well discharged batteries, it will run continually. When there is only a small current draw, then the fan will run only occasionally. PDI converters do use a thermostatically switched fan.
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Jim & Roy Davis
2016 Hurricane 31S
1961 Rampside in tow
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