The inducer motor is the small motor hooked to the vent pipe going out of the house. This is the very first thing that comes on during a heat call. This has to be running in order for the pressure switch to prove and allow the igniter to light.
Find the pressure switch it will look like this.
There will be a rubber hose that attaches this pressure switch to the inducer draft motor housing. Take this rubber hose off and blow through both ends. Then take a paper clip and clean out the tiny port on the inducer housing where this hose slides on.
Put it all back together and try the furnace again. Let me know what happens.
not sure what the wood is may be they drilled a hole in a board or something above the furnace and these shavings dropped down on it.
From you describing a burning type electric smell and the humming noise you referred to earlier I think your inducer motor may be bound up and not turning. This would cause the furnace to not ignite.
Let's do this.
Take the two wires coming off of the pressure switch you found earlier I believe they are an orange and a yellow wire. Turn the power to the furnace off and unplug these two wires.
Now with the wires hanging unhooked turn the furnace on. Once power is restored to the furnace connect these two wires together with a piece of metal of some sort. No worries this is just the common side of a 24v circuit it will do you no harm. At the very most it will give you a tickle if you happen to touch he actual metal on the plugs it will feel like a 9v battery when you stick your tung on the end, but just handle the plastic sheath on the wire only and you will be fine.
With these wires hooked together see if the igniter glows. Let me know.
bypassing the pressure switch like this should make the igniter come on. When you say you shorted the two connectors together you mean you connected the two loose wires correct?
This should make the igniter glow unless the igniter is bad. By connecting these wires together we have eliminated the venting system from the equation.
The only thing is that you must allow the furnace to send the signal to the inducer motor to start up before you can short out the two wires. So it is essential that you start the furnace up with the two wires unhooked then after about 10 secs once the furnace power is restored you hook them together or the bypassing will not work.
Ok lets test the igniter then.
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unplug the igniter at it's little white male female plug connector.
hook the pressure switch back up the way it should be.
Now let the furnace start up and see if you are getting 120v to that plug going to the igniter. with one lead on each prong of the plug it should show 120v.
Take in mind it takes a good 90 seconds for this signal to be sent to the igniter once power is restored to the furnace and the inducer motor comes on.
the switch on the wall is fine.
I posted earlier about the codes I will cut and paste what I said here again.
that is code 12. code 12 is displayed any time you cut power to the furnace off and back on. it will flash this for 90 seconds with the main blower running and then it will either go into ignition sequence or it will become a different blink code telling you what the actual fault was.
Now when you cut power off then back on you have to let the furnace go thought this 90 second purge while it blinks this code 12. After this 90 seconds then you can go into bypassing the venting system like we talked about earlier.
If the motor is getting the 120v but doesn't spin then that has to be the problem. You should be able to jump the pressure switch out like I told you earlier once the inducer gets this voltage and it should light the igniter and start the furnace, but if you can visibly see the inducer trying to spin and not spin then that is your problem.
that is the replacement motor for your furnace it is up to you if you want to try and do it yourself or if you want to get someone out there to do it. Just know that if you purchase parts on line and they are not installed by a licensed professional the manufacture has the right to void the warranty on your furnace.