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Attic fans Our attic fan keeps turning on and off every 10-15 seconds or so. Is this normal? If not, what do I need to look into? Is this controlled through the thermostat?

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  • Anonymous Aug 04, 2008

    Sounds like a thermostat issue. You may want to have an electrician bypass the thermostat to test this scenario, and you may also want to call the manufacturer to get a new thermostat.

  • marreturns Oct 10, 2008

    it is 75degrees outside. attic fan keeps turning on and off every 15 seconds. is this a broken thermostat?


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I just fixed a Broan-353 with a similar problem - the fan was short-cycling, turning on and off within a minute or less.

These fans have a thermostat which is designed to turn off 10 degrees below where it's set to turn on. Apparently, one failure mode is this temperature delta stops working I've had this happen twice, each time after about 3 years.

Replacement thermostats are available from Broan for about $30 It's a 10 minute repair if you have easy access to the fan.

Posted on Jul 03, 2010

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I'm having the same problem and I can tell you that it probably isn't the motor. I replaced the motor with no effects. I'm gonna bypass the thermostat to test it out and order a new one.

Posted on Aug 04, 2008

  • Jeremy Singleton
    Jeremy Singleton Aug 05, 2008

    Well, bypassing the thermostat did not help my situation. Turns out when my attic is over 120 degrees the fan only runs for 2 mintues on, two minutes off. When my attic is under 120, the fan runs and operates fine, with or without the thermostat. This tells me that the motor can't take the Texas heat and I am probably going to add a few more static vents to help it out. I'm using a Nutone RF59NRPSC.


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