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Furnace GMS9/GCS9 Cycles twice and then fires up most of the time and then it won't fire and shuts down. To restart it We have to shut the 110/115 power off for a few seconds and turn it back on and it fires up.

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Furnace ignition controls will attempt to light the furnace 3 times with several minutes delay between each attempt. If it fails to light or the ignition module fails to detect it lit after the 3 tries, the module will lock out and require a "Hard Reset" to try again. It is a common feature in nearly all newer furnaces intended to let you know you have a serious problem. You should call a service technician for this because there are a number of things that may be causing this flame failure. Please grade my answer on how much I have helped you. Thank you for the opportunity. Roger

Posted on Apr 05, 2011

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My furnace fires up run for about five minutes then fire box shuts off and the fan runs until my furnace runs through its cycles but the fan runs almost continually runs it only shuts done for a few...


On a conventional furnace of today, your furnace may have a flame sensor which is typically located in front of an end burner opposite the ignitor. It is connected by 1 wire. This metal rod needs to be removed by 1/4'' screw in most cases and cleaned. Clean with steel wool or even a clean greenie scrubber will work. Wipe clean and re install. Many problems can cause these symptoms, but this is a very common one.

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Apr 04, 2012 | Goodman Heating & Cooling

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My furnace stopped working. It'd start up shut down start up shut down all in the matter of seconds. Then would fire up and work. it did this maybe once every couple days then it stopped all together. ...


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Mar 04, 2011 | Goodman GMS90703BXA Heater

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After furnace runs for a while and cycles off furnace will not fire back up unless I power off then turn back on


You should have the unit serviced. Each time you shut off power you are resetting
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My furnace heats the house well, but during the cool down it actually blows cold air dropping the temperature causing the furnace to re-ignite. How do I adjust? Goodman - GMS9/GCS9


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How to manually relight a Goodman® GMS9/GCS9 Single-Stage, Multi-Speed Gas Furnaces


You should NEVER attempt to relight manually this furnace. Serious burns could be the result. This furnace has an electronic ignition and should light by itself. If it does not light you may have a bad ignitor. These are usually around 30-50 US dollars.

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