2 Answers

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?

Posted by on

  • 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?



2 Answers

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 1 Answer

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

  • Level 1:

    An expert who has achieved level 1.

  • Contributor
  • 2 Answers

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.



1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

A 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
The service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
Good luck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

2 Answers

2002 4 ton Bryant air conditioner shuts off, fan still runs but not cooling is problem in the controls in the attic or in the AC unit or both?

With a non heat pump it is a simple 24 volt AC control circuit. In the attic there is a relay that is actuated via the fan control wire directly from the thermostat. On the thermostat there is an auto/man switch that controls the fan. Manual the fan runs all the time. Auto fan turns on and off with the outside compressor.

If the system is not calling for cool and the fan continues to run the fan relay is sticking. common problem. Sometimes after running for several days the relay will stop sticking if not, replace relay.

If the system is calling for cool and the compressor stops I would still expect the fan to run until thermostat tells the A/C to off. Some compressor units include a safety switch or high-pressure cut-out switch A blocked internal valve bad control board or external fan in outside unit defective no air flow in outside unit.
High pressure cut out not good,

Suggest turning temp max cool and observe. If acceptable cool and the compressor runs without interruption all is good, except for the blower in the attic. Safely check relay in attic blower circuit.

Hope this helps.



Jun 28, 2017 | Bryant Heating & Cooling

1 Answer

Looking for a bimetal-adjustable thermostat control for a home/window box type fan.

Try your local hardware store. Ask for a replacement for an attic fan thermostat.

Apr 13, 2015 | Cars & Trucks

1 Answer

I just installed a master flow attic fan. I ran

Sounds like it could be a bad capacitor (black box on side of motor).

Jul 19, 2009 | Cool Attic Dryers

2 Answers

Ruud AC fan won't shut off

In many mobile homes this scenario is very common, less so in permanent homes, but here is how it works; The heat side of your fan which is the low fan speed is not dependant on the thermostat it's heat activated. Your already aware of this to some degree because you had the limit \fan switch replaced. I've taken that approach to that unit myself. In reality what probably is happening is on hot days your unit is warming up by being hit by sunshine and then it clicks the fan on at 140 degrees. This especially happens if the unit is on the roof or a split system in the attic. Remedies; run your A\C to cool it down, keep your attic cooler by way of an attic exhaust fan(which saves you cash anyway). Or if your not regularly using A\C turn breaker off til you need it. In the end there may be something going on, but odds are I'm dead on. Good Luck

Jul 12, 2009 | Ruud UBHC Air Conditioner

3 Answers

Replace old attic fan motor, or replace the entire fan assembly.

I am assuming you replaced your fan by now. However in the future call Gibraltar Industries, they are the ones who manufacture all fans and motors. My attic motor fan also died and I first called Ventamatic and they wanted $65 for a new motor. I then called Gibraltar and they shipped one our for free. 800-527-1924.

Jun 26, 2009 | Ventamatic Gable Mount Power Attic...

1 Answer

Broan attic ventilator appears not to be working

Did you check to see if the motor was warm or made a noise?

May 19, 2009 | Broan-NuTone Nutone Aluminum Dome power...

1 Answer

Broken mount attic exhaust fan

buy new blade or keep soaking shaft.collar with rust penetrant,

Jul 25, 2008 | Ventamatic Gable Mount Power Attic...

Not finding what you are looking for?

Related Topics:

1,794 people viewed this question

Ask a Question

Usually answered in minutes!

Top Broan-NuTone Dryers Experts

Mike Squire

Level 2 Expert

420 Answers


Level 1 Expert

6 Answers

Are you a Broan-NuTone Dryer Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides