Question about Ventamatic Direct Drive Whole House Fan With Univer

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Attic fan stops running after one hour

We installed Cool Attic Fan CX30BD2SPD two weeks ago and haven't really used it much. Last night after running one hour on low, it stopped. Turned it off and tried it later, it did the same thing. Is this normal? Haven't ran it on high yet. Does it regulate itself and restart or is this defective?

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  • Anonymous Apr 27, 2009

    only when the fan is on medium or low speed does it shut off. in about 15-20 minutes it starts working again.

    if it is the motor, would it be cheaper just to replace the whole fan unit?


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Whole house attic fan motor overloading/heating shutting down and then resets itself -- it runs for several hours and stops and then restarts on its own. John C. Flood Plumbing quoted me $300 to fix it and then upped the charge to $900 for just the motor.

Do I have a fire risk with this happening? How much should it cost to replace the motor?

Posted on Jul 04, 2011

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Why is the fan only working on low speed

Posted on Sep 19, 2010

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The Question that needs that needs an answer is; Is a belt driven fan motor? If yes than the fan motor Belt Tenxion on the motor is critical. The tighter the Fan Belt the motor amperage will increase and will exceed the motor rating. The motor is designed with a thermistor that protects the motor from burning up, plain and simple. While tightening the fan blade you must check the actual reading with an amprobe to stay within the name plate reading.


Posted on Jul 21, 2009

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I need to verify you have adaquate air flow, to cool the motor. If you have a window open, and the crawl hole open is there enough air flow into the the attic? It there is enough air flow and it still stops after about an hour, does this unit have a humidistate and a temperature switch on the housing or extension.
If all the switches are working correctly then I could be the motor overloading/heating shutting down and then reseting.

Posted on Oct 13, 2008

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