You have run all the tests and they all point to your igniter being bad in your gas furnace.
Your purge blower runs, the power comes on to the igniter, but you get no glow from that little wonder. This is how can it be changed?
Boiler Engineer
Changing the igniter on your gas furnace really is not all that hard. But it may require a bit of patience and some tools that can get into some very tight quarters. Some furnace manufacturers have design their units to make this job very easy. Some other engineers obviously have never got away from their desk and picked up a screw driver. Hopefully you are lucky enough to have one of the easy ones.
The higher the efficiency of your furnace the harder this job will be. Usually the 90+ furnaces will have the burner compartment sealed. You will have to get the covers off of the burner compartment to get to the igniter. On the 80%er’s the igniter will usually be somewhere on the burner nearest the center of all the burners. Make sure that you remove all power to your furnace before you attempt to remove the igniter. It runs on 110V power and will give you a good jolt if you touch it with power going to it.
Once you have located the igniter, you will need to find the screw or screws that hold the igniter in place. Remove or in some cases just loosen the screw and remove the igniter. Take careful note of the location and position of the old igniter so that you can reinstall the new one in the exact position as the old one. In most cases the wiring will just be a Molex plug that you can just unplug the old igniter and then plug your new igniter back into it.
Carefully position the new igniter into the same location and tighten the screw(s) that hold it in place. Plug the new igniter into the plug and replace the covers on the burner compartment if there is one.
Now you can turn the power back on to your furnace and try for ignition. Hopefully you get the glow and ultimately fire in from the burners. This will give you heat and make everyone happy!
How to Change Your Gas Furnace Igniter
Floyd Kolb has worked in the Mechanical/Hvac industry for over 20 years, gaining a wealth of knowledge to share. I have provided solutions to over 20,000 problems at Fixya.com You can check out my solutions and read the many tips that I have wrote about HVAC and appliance related problems. http://www.fixya.com/users/heatman101
boiler engineer
