Hello XXXXXXXXXX,
Thank you for asking your question on JustAnswer. The most common reason for this problem is a dirty flame sensor. The flame sensor detects the burner is lit. When the flams sensor gets dirty it cannot detect the heat correctly and shuts the furnace down, thinking the burmer has not lit. Click here for more information on the flame sensor, the test needed to check it and how to clean it. After reviewing this information please let me know if you have other questions.
I like all my customers to have this information. Many homeowners do not realize, the complications of not having a professional inspect the heating system yearly, can cause. If a fire, or worse, is caused by the furnace and there are no records of the furnace being maintained, the insurance company can and will deny the claim for damages.
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HVAC Technician
I have been repairing and installing HVAC systems for 30+ years