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How Does Fan-Tastic Roof Vent Fan Turn On and Off Automatically

Question:

The motor that opens the vent wants to stay on all the time. Is the problem with the circ. board, vent lid switch, or motor it self. What tells the motor to shut off.

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Expert Reply:

The Fan-Tastic Vent Roof Vent w/ 12V Fan # FV801250 you referenced is a 3 speed, reversible manual lift vent with fan. So I am not aware of a motor that lifts the lid on this model.

The fan will automatically turn on when the lid is open, the speed switch is on 1-3, and the in or out switch is flipped to one or the other. If the speed knob is on 0, or the in and out switch is in the middle, the fan will turn off or not come on.
I included a couple inserts from the instructions that show the speed knob, and the reverse switch.

If this doesn't stop the fan, or fix the problem let me know and I am happy to troubleshoot and find the right solution.

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