How Do You Troubleshoot Furnace Pressure Problems?
If you are having pressure problems with your furnace, this article can help, but it’s important to follow these safety guidelines before trying to diagnose the problem: Always read the safety instructions and warranty information that came with your heater. Be sure to turn off the electrical power and/or gas. And be sure to read this entire list of instructions before starting the troubleshooting process. Verify that the opening where the draft inducer (it may be metal or plastic, depending on your furnace) attaches to the pressure switch tube is actually open. It may attach at the top, bottom or center of the draft inducer. Check to see that all safety devices are closed. This includes all limit controls. These items are programmed to prohibit the ignition process from starting as a safety mechanism, so if they are not all closed, your furnace will not start. Test the pressure switch itself to see if the problem lies in the switch. Using a volt ohm meter, place one meter probe on a l
