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Discussion Starter · #1 ·
My gas furnace will light, then shuts off after 3-5 seconds. I have found this problem on several chat rooms, and the recommendation is to clean the flame detector. I did that and it did not fix the problem. I have since replaced the flame detector and still have the same problem. Does anyone have a suggestion for a next step?
 

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30 year tech
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427 Posts
Could be that the burners and crossovers need to be cleaned so that a good flame is hitting the flame sensor.
 
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