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Furnace begins the process of starting up then 5 seconds later it turns off. It does this repeatedly, sometimes for like an hour then it works fine.

The furnace begins the process of starting up then it shuts down. It varies in the times it does it, sometimes and hour, sometimes less. It can go days without it having issues.

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  • Goodman Master
  • 8,220 Answers

Easy fix. Furnace is not getting confirmation of ignition. Remove the flame sensor and clean it with sand paper. re-install it and retry as seen in this video:

Posted on Oct 26, 2012

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6ya6ya
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Posted on Jan 02, 2017

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  • 96 Answers

SOURCE: My GOODMAN furnace GMH80703ANAA Starts but quits 5 seconds later

You have a flame sensor that may just need cleaning take out and take fine sand paper or emery cloth and clean

Posted on Nov 30, 2008

mrgrzz
  • 88 Answers

SOURCE: furnace blower not working how it should

first off buy yourself a honeywell stat, in my personal opinion lux stats are garbage, I have run into so many that are bad stats !!! but as far as your fan not shuting down, sounds to me like your fan center on your circuit board is bad and will not shut down the fan when needed, you will have to replace the circuit board, as the fan center is a part of the whole of the circuit board, hope that helps

Posted on Jan 20, 2009

Therinnaiguy
  • 1420 Answers

SOURCE: Amana Air Command 80 SSE gas furnace will not stay running

In the path of the flame on the last burner that starts, there will be a small rod. That rod is the flame sensor. Take a scrub pad and polish it. Also check the electrical connection that goes back to the circuit board. Disconnect any ground wire from the circuit board to furnace cabinet, sand it and replace it.

Posted on Mar 14, 2010

  • 39 Answers

SOURCE: I have a Rheem Criterion II Gas Furnace that has

Turn off the power to furnace.
on the last burner to light there is a small metal rod in front of the burner. This is a safety called the flame sensor. It is dirty. Unscrew it from the bar ( 1 Screw) unplug the connector wire from it and clean it with steel wool. it will be kind of burnt. Plut back in place and turn on the furnace to cycle.

Posted on Apr 04, 2010

  • 5 Answers

SOURCE: Ruud Silhouette II Gas Furnace, purges, lights

Flame sensor needs to be cleaned. turn off the furnace power switch or breaker. pull the flame sensor located in the burner runner section of the furnace. It will be easy to locate because it has 1 wire running to it. pull the screw being very careful not to harm anything else. get the sensor out. inspect it for cleanliness. clean the sensor with light grade sand paper gently. re-install the sensor plug the wire back on. restart your furnace and this should fix the problem.
CookHVACR

Posted on Nov 19, 2010

Testimonial: "thanks cookhvacr, took 15 minutes and it seems to be back to normal operation."

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