Some times the switch at the fan in the Fan-Tastic Vent Roof Vent w/ 12V Fan and Remote - Powered Lift - 14-1/4" x 14-1/4" # FV807350 can get corrosion and will need to be cleaned.
Loosen and tighten the bolt on the plunger then using your finger push it it and then slide your finger off so the spring will force the plunger to seat and knock off any loose corrosion material.
If that doesn't work use a 7/16 wrench to remove the plunger and spray it down with some contact cleaner and replace.
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