Furnace issues & what to do.....

Gas furnace burners won't stay lit? This is not an uncommon problem, and sometimes relates to how well the furnace has been previously maintained. Listed below are some common reasons for this problem:

The burner ignites but then goes out before heating up your home Situation: You turn the thermostat up, the furnace ignites and the burner comes on. The furnace stays on for awhile (maybe 1 minute, maybe 10 minutes) and then goes out. The fan continues to run even though the flames and pilot light go out. 
Possible causes:

• Overheating. Your furnace has a limit switch that keeps it from running if the heat exchanger is too hot. Dirty filters, closed or blocked vents and other blockages in airflow are common causes of an overheated furnace.
• A bad limit switch. The limit switch may be bad and need to be replaced.
• Bad thermostat. Your thermostat may be incorrectly telling your furnace that your home is warm enough, which shuts off the burners.
• Bad flame sensor. A direct ignition furnace has flame sensor over the burner that shut off the gas if it doesn’t sense a flame. 
• The best way to correct this issue and get your home warm again is to contact a licensed HVAC technician to evaluate your furnace. 

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