Sorry for the lateness..
The internal thermistor has no control of the fans whatsoever, only the external snap switch you replaced. So that was the issue. As far as the upper screen, rather than remove the entire exhaust stack and have to re-screw it and weather seal.. simply cut out the screen out.. Home Depot sells a roll of the identical screen, slightly wider than the exhaust vent. I formed a drop-on vent that allows me access to that area anytime i need to get in. Remove vent top, remove screen, viola...
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Jeff - WA6EQU
'06 Itasca Meridian 34H, CAT C7/350
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