Our Comfort Maker furnace (Model FBF100F14A4) starting acting odd at the end of last winter; when the ignitor would start the pilot, the control module would click twice and that clicking became slower and slower as the winter progressed. Eventually, around March, it seemed as if it would stop altogether. Fortunately it didn’t.
There are only two parts in the ignition system, the control module and ignitor.
Using the technical support manual that came with the furnace, the part numbers were cross referenced with the replacement items from Honeywell using RepairClinic.com. Purchased the replacement parts from there as well; the control module here and the ignitor here. Everything was in stock, shipped quick. But the items can be purchased for a lot less on Amazon.
Honeywell control module module number: S8610U3009
Ingnitor part number: 011483
In case you’re working on the same furnace, and don’t have a copy of the TSM, here it is:
A word of caution: this process will be specific to this particular furnace. Yours will probably be different.
To get started, at the thermostat set the furnace to Off. Also, flip the power switch that (should) be located on the side of the furnace. Lastly, turn off the gas. Remove any access panels on the front of the furnace.
Locate the items to be replaced. The control module is located on the right side, mounted to a bracket. The ignitor is located under the burner. A couple sheet metal screws secure the bracket to the side of the furnace, remove both.
The wire connectors are a tight fit, be sure to pull on the connector itself and not the wire. Pulling on the wire could cause it to come out of the connector, or worse make an intermittent connection. If needed grip the connector with needle-nosed pliers.
Move the wires from the old module to the new, with one exception: the wire that was on connector 6, 24V, should be connected to TH-W on the new controller. The module will not work if this is not done. The LED diagnostic will not light up and the ignitor will not ignite.
Once the module is wired and mounted, proceed to the ignitor installation. This process is straight forward, but caution must be exercised with manifold. It’s an aluminum tube that can distort and bend quite easily.
Remove the two screws that hold the ignitor bracket in place, located under the burner. Next, using a 7/16″ wrench, remove the brass fitting on the valve. Remove the assembly.
Remove the brass fitting from the ignitor using a 1/2″ to hold the ignitor, and a 7/16″ wrench on the brass. Again, be aware of the aluminum tube. Transfer the mounting bracket and reverse the above process to install the new ignitor. Be sure to secure the wire away from the burner, follow the manifold if possible.
Test all the connection making sure all electrical and mechanical connections a secure. Turn on the gas and check for an leaks. Next, turn on the switch and finally the thermostat.