Thank you for asking your question on Just Answer.
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.
The first thing I would suggest checking is the flame sensor. It will cause the problems you have describes. The flame sensor can be cleaned with a wire brush or sandpaper. The flame sensor very seldom become defective, unless their ceramic base cracks. Check the base for cracks while cleaning the flame sensor and replace the sensor if the base is cracked. This problem can also be caused by lack of cleaning the furnace and having the burners cleaned.
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. I have worked on systems after they have caught fire and the homeowners got no help from their homeowners insurance for the damage. I have installed furnaces in new homes that the owners were building to replace a home that was destroyed by fire from not having the furnace serviced. I like every customer to have this information to consider before repairing the furnace themselves.
Yes the flame sensor is a common part and all gas furnaces unless they are a very old model. Yes, I have worked on Many Coleman Furnaces and assisted several customers with repairing their units. Click here for information about the flame sensor.
Should you require further clarification, never hesitate to ask. It would be my pleasure to clarify my answer to your question. If after reviewing the above information, you have additional questions, I will be glad to answer them. My goal is your 100% satisfaction with all questions I answer. Please click the green ACCEPT icon if you feel I have given a complete answer, and you are satisfied with my answer. Positive feedback and bonuses are always greatly appreciated!Regards,EdwardAs always when using Just Answer your accept is required for me to be paid. Please do not accept unless you are 100% satisfied with the answer.Please do not accept my answer if you do not feel comfortable with my qualifications or the information I provide. If you accept my answer please leave feedback.
The tube that connects the draft inducer to the pressure switch can get dirt in it. This will cause the pressure switch to shut the furnace down. The ports that the hose connects to can get stuff in them also. This can be cleaned out using a small wire. Do not blow into the pressure switch or it will be damaged and will need to be replaced.
Other things that can cause a problem with the pressure switch shutting down are dirty filters, an A coil that needs to be cleaned, any blocked return air vents, dirt on the draft inducer blower blade, dirt on the furnace blower blade and a obstruction in the chimney that would keep the chimney from getting a good draft.
I believe one of these are causing the problems you are having.
Please do not accept unless you are positive you are 100% satisfied with the information provided. Let me know if you would like me to opt out and have another expert assist you.
You have done a very good job at providing the information and trying to correct the problem. The main board of the furnace is expensive and to continue to replace the parts that are not known to be the problem will get very expensive fast. I am going to opt out of answering this questions since the only suggestion I have left is to have a professional that can be there to diagnose the problem, diagnose and repair the furnace.
Please do not hit the accept icon until you have the needed answer. It was a pleasure to try and provide you the answer you needed to repair your furnace, but to continue could cost you to spend money that may not be necessary. My goal is 100% customer satisfaction with all customers who accept my answers. Since I have not provided you the information needed to repair your furnace do not accept until you have the needed information.
If another expert has the answer, hopefully they will respond soon.
You are welcome. Hopefully you will get a response soon.
There is no need to reply to this post unless you have additional questions. It will only generate a request for me to reply to your post.