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Old 08-08-2017, 12:11 PM   #1
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Vent fan shuts off when top lowered

I have a Max Air cover over my roof vent so I can leave the vent open when it is raining. I leave the fan running much of the time.
I leave roof vent open now when towing. I noticed when I put the top down the vent fan shuts off.

Is there a pressure switch somewhere that causes it to shut off?

I would like to leave it on low when towing to pull more fresh air through it.

I know when camper is up that the switch close to door, for power must be on.

Any ideas?
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Old 08-08-2017, 12:28 PM   #2
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Yes there is a shut off switch when lid closes
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Old 08-08-2017, 12:31 PM   #3
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There is a safety shut off so the motor does not get burned out or over loaded.

Some safety switches are adjustable via nut on a threaded part of the switch... and some are not adjustable to help fine tune where it shuts off.

IMO be careful leaving the fan run while you are traveling... with all the jiggle and bouncing during travel the vent cap may close and cause heavy load on the motor ... it may damage the motor.

If you have vent covers...Just leaving the vent cap wide open should draw some air through with motor turned off.

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Old 08-08-2017, 02:08 PM   #4
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with a popup all closed up, I am not sure you are gaining anything to have the fan run. I would think that the canvas blocks the fan.
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Old 08-09-2017, 12:46 PM   #5
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I can't imagine any benefit to leaving the fan running while a popup is closed up. That sounds like you are asking for trouble.
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Old 08-09-2017, 12:53 PM   #6
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I see no trouble in fan running closed up. Inside the fan is not obstructed by the folded down canvas material. The reason I thought about leaving it running was to draw in fresh air and have air moving through to keep air from becoming stagnant; no other reason or need for it. I have a Max Air vent cover on top that fits over the vent fan top so it can remain open during rain or travel. I thought there might be some sort of contact or close switch that shut off power to the fan when top of PUP comes down. Fan was on before, then went off when top was down. I didn't now where this cutout switch was. And it isn't the winch contact shutoff switch because fan went off before the top was all the way down.
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Old 08-09-2017, 01:04 PM   #7
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There is actually a plunger type switch in almost every P/U I have ever seen that shuts off all power to anything in the top when closed ( top down). This is a safety feature as the lights in most P/Us can touch the bedding /mattress and could cause a fire if powered on with no air flow and touching the bed. I would not disable that switch as forgetting to turn off a light could prove dangerous. That switch should have been pointed out during PDI.

Side note you might want to add your Rv model number in your sig or personal data. It would help people to know your specific situation.
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Old 08-09-2017, 01:31 PM   #8
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If stale air is a concern in your camper I would do something like this in the closed up camper...

mold and mildew is the enemy with damp air enclosed in the camper

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Old 08-09-2017, 02:41 PM   #9
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I see from another thread, you have a highwall popup. The cutoff switch is in the roof (front corner street side). It also shuts off the lights so you don't burn the canvas when you accidentally leave lights on. I would not disable it, it is a safety feature.
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Old 08-09-2017, 02:46 PM   #10
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Sorry... My road home is an 2018 Forest River RV Flagstaff High Wall HW27SC.


The shut off switch mentioned above was pointed out as the shut off plunger switch for the top and shuts off the raise/lower motor.
If there is another shut off switch I don't know about it.


When the top is not even contacting the motor shutoff switch, I stop before that point to do a final tuck and check... the fan is already gone off.
And I understand the safety of lights and other being left on.


Not particularly having a problem with any unpleasant odors... just that shut up feel and smell when you open your cabin, camper or closed up room.
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