Hi Customer. Thank you for asking your question on Just Answer. The other Experts and I are working on your answer. By the way, it would help us to know:-Could you explain your situation a little more?
What is the make and model number of the furnace?When was the last time the furnace was professionally serviced?What is the age of the furnace?What fuel does the furnace use?What have you tried to correct the problem?Do you have a digital camera that you could use to send pictures of the furnace if needed?Thank you again for trusting us with your problem. Please reply as soon as possible so that we can finish answering your question.
This problem can have several causes depending on the furnace that is in your home. The most common problem is a dirty flame sensor. Click here for information on the flame sensor. I can provide you more specific information when you have answered the questions in my last post.
The problem with the burner not staying lit is very likely as I had guessed a problem with a dirty flame sensor. Clean the sensor following the information in the link I provided and let me know if that corrects the problem. You may also have a problem with a sticking fan limit switch that will need to be replaced. This will cause the fan to continue to run.
The main blower coming on and continuing to run until it is manually shut down is more than likely a fan limit problem. The burner lot staying lit is more than likely a dirty flame sensor.
Just clean the flame sensor you removed following the directions in the link and it should be fine. Click here for information on the fan limit control and here for fan limit switches.The limit switch will be connected to the heat exchange. If you have a digital camera that you can send an image of the inside of the furnace taken from the front of the furnace with the service door removed, I can likely point the part out to you.
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