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why does my oil fired furnace keep short cycleing on for 3 minutes then fan only then furnace back on for another 3-4 minutes
 

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Sounds like low air flow. Check your air filter. A/C coil may be dirty.
 

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Fix your air flow problem. that a very big oil furnace, so you need a lot of air movement.




PS: Don't make duplicate threads, the other one has been removed.
 
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