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Old 04-30-2018, 06:22 AM   #1
Montana Fan
Join Date: Jul 2013
Location: Murfreesboro
Posts: 139
M.O.C. #13637
Fantastic fan rain sensor

Hi All, Anyone had trouble with the rain sensor? and can it be replaced? I have power to the fan, When we turn it on we get a beep and will not open. I assume its the sensor that is causing the problem. We have the standard thermostat that will turn the fan on and off , It does not have any lights or any type of sensor bybass that I am aware of.
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Old 04-30-2018, 09:05 AM   #2
Montana Master
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Join Date: Jun 2011
Location: Wilsey
Posts: 16,717
M.O.C. #11455
Try cranking it open by hand, using the little knob. Mine have stuck shut from time to time when they arn't used for extended periods of time like over the winter or during the hot summer.
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Old 04-30-2018, 09:13 AM   #3
Montana Master
Join Date: Sep 2013
Location: Pensacola (mail forward service)
Posts: 2,857
M.O.C. #13740
I have had to take steel wool to my rain sensors on previous rigs. It could be that the sensor is shorted out by some kind of corrosion and that is telling it to stay closed. If you manually open the lid, you can look at the sensor from on the roof. It is a plated squiggly line affair. And while up there you can push the plunger type switch to see if your issue is probably related to the switch located in the fan assembly that tells the fan motor to turn on after the lid has opened enough or the lid is stuck to the rubber seal.
2012 F350 6.7 L dually, 2013 3800RE with 6 pt leveling, Sumitomo 17.5" load range h tires, Samsung 18 cu ft residential fridge, 8k Morryde I.S. with disc brakes. Full timing since 2012.
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Old 04-30-2018, 10:13 AM   #4
Lenny K
Montana Master
Join Date: Jun 2014
Location: Vancouver Island
Posts: 870
M.O.C. #14417
The fan over the island always refuses to open after not been used for a long time. As DQDick said open it up by hand and then it will work as it should. I've applied 303 on the seal and also tried silicone to stop the seal from sticking without any luck.
Lenny and Ros
2012 Montana 3400RL,680 Watts Solar,4xT-105 Trojans,GP-ISW2000-12 Inverter,Trimetric 2020, EMSHW50C
2009 Chevy Silverado 3500 LTZ Duramax 4x4 CC Dually, Banks Speed Brake

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Old 04-30-2018, 02:33 PM   #5
Montana Master
Join Date: Feb 2003
Location: Englewood
Posts: 3,087
M.O.C. #164
As I remember the rain sensor is a small circuit board mounted with two screws.
I find fantastic fan to very helpfull I would give customer service a call and get some tech.helpI would not be suprized if they sent you a rain sensor no charge☺
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Old 05-02-2018, 09:43 PM   #6
Established Member
Join Date: May 2017
Location: ormond beach
Posts: 44
M.O.C. #19826
I had a vent that would shut down for no reason, rain sensor would activate every ten minutes or so. I called airmaxx and they sent me out a new circuit board and that took care of the problem. Was super easy to do, took about 15 minutes and is all done from the inside and it is all plug and play
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Old 05-03-2018, 05:55 AM   #7
Montana Fan
Join Date: Jul 2013
Location: Murfreesboro
Posts: 139
M.O.C. #13637
Thanks all , ill contact them and see what happens.
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Old 05-03-2018, 09:36 AM   #8
Montana Master
Join Date: Oct 2006
Location: McKinney
Posts: 5,250
M.O.C. #6433
Years ago my Fantastic Fan stuck and would not open. I called them and lady said I should go on roof and open by hand to break the seal. And she would send something to clean the rubber gasket with. What she sent was a small pack of 303. Cleaned it well with that and has never stuck again, even after sitting for long periods.
Bill & Patricia

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Old 05-03-2018, 01:54 PM   #9
Montana Fan
Join Date: Jul 2013
Location: Murfreesboro
Posts: 139
M.O.C. #13637
I can open with the manual handle , Its not stuck to the seal. It beeps when I try to open or turn on the fan. Got to be related to the rain sensor.
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