This gas furnace troubleshooting flowchart should help you troubleshoot and see what is wrong with your furnace. Just follow the steps. You will need a volt meter for testing. The picture below is pretty small, especially if you do not have any zooming capabilities with your computer. We have a link for a downloadable PDF file if you want to print the chart out so you can read it and take it with you while troubleshooting. Please click on the following link if you would like the downloadable PDF flow chart.: furnace troubleshooting flow chart If you have any questions please email us anytime. Our email address is: firstname.lastname@example.org We would love to help you out and have your business!