I was not able to find a manual. Would you like some help.
The only way that I can help is through this site. We can not call out. Would you like some help?
Ok. The sound that you here hum is it coming from the inducer motor (small motor above the burner section) or is it coming from the circuit board.?
First thing you can do is shut the thermostat off and go to the furnace and locate the burner area. If there is a light switch turn that off there also for about 5 seconds (long enough to reset the 120 volts. Then give a call for heat at the thermostat and go back to the furnace and see if the inducer motor starts up. This is the first thing that happens on a call for heat.
Do you see your inducer motor?
Above link is an inducer motor.
Ok. Reset your power again for about 5 seconds so you can start the timing sequance over. You will want to find the small blades on the inducer motor and once you have found them try to turn them with pencil. They should be able to turn freely.
You can up load pictures here.
Right next to the Youtube button there is a tree button you can push and upload off of your desktop.
Another quick question. Do you feel the vibration on the inducer motor like it is trying to start up?
I guess my screen is set up a little diffirent. Do you get the last question I ask?
Are there terminals that these 5 wires go to labeled?
This is sounding more and more like a relay that is stuck closed.
Are these your low voltage wires? R, W, Y, G, and C?
Ok. Are you saying that what makes the hum sound is behind the metal plate at the top that has the Warning label on it?
No. Let me open this question back up for someone else.