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TOPIC: old furnace

old furnace 10 years 10 months ago #4604

  • Wyo. Jackolope
  • Wyo. Jackolope's Avatar Topic Author
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I have a 17 year old furnace that keeps cycling on and off every 5 min. I turn on the blower to "run" mode so as not to burn up blower but is there something else I should do. Or is this a problem?

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Re: old furnace 10 years 10 months ago #4613

Aaron sounds like your fan limit control is bad its the dial inside the little metal box hope this helps

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Re: old furnace 10 years 10 months ago #4655

Aaron - sounds like short cycling to me, turning on and off too frequently.  It usually indicates a malfunction.  Is this a furnace or boiler?

If a furnace it could be a malfunction of the upper-limit switch.  This is the device that turns off the system when the desired temperature is reached.  If it is set too low, or malfunctioning, it may turn the burner off even though the temperature is still too low.  This switch can also turn it off if the filter is dirty, and AC coils are dirty, the fan is faulty or your ducts are too small.  Closing off many registers to try to adjust air flow up or down can also cause it.

You need to have it checked.  It sounds like it is electrical...

Hope this helps!

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Jay Markanich Real Estate Inspections, LLC
Based in Bristow, serving all of Northern Virginia
www.jaymarinspect.com
Northern Virginia Home Inspector
Festina Lente - Make Haste Slowly

Re: old furnace 10 years 10 months ago #4664

I have had one of my rent houses do this same prob. and it was just as yall say.  But I have also had this some prob with my own unit.  Turned out it was a lil pressure switch on the exhaust fan.  It was a safety switch to make sure the exhaust was exiting correctly.  Either way, you need a HVAC person.

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We are a licensed inspector for the state of Oklahoma.?  Our focus is Oklahoma City, Moore, Mustang, Yukon, Tuttle, and many other areas surrounding OKC.
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