WHEN I TURN ON THE FURNACE ALL IT DOES IS HUM NOTHING ELSE

Have you turned all power off to the furnace? Leave it off for 30 minutes,then turn power( breaker preferably) back on and see if it will come on. Probably not,but has worked for me.
Check for power coming into the furnace.Some have a fuse or breaker where power goes into furnace. don-ohio (:^)

The hum could just be the control transformer, but that's usually a very light and barely perceptible hum. If its a louder hum, and it stops after a few minutes, the hum could be the blower motor refusing to start for any number of reasons, then cycling on its internal winding thermostat.

I'd call a service tech.

Sound like your inducer motor stuck

the hum is probably coming from a relay. there is nothing in a transformer to hum.

Have you checked the capacitor? Try spinning the blower wheel by hand, if this gets the motor going you have a bad capacitor. If not, the motor will need to be replaced.

Hello, yes the transformer will get a 120 volts from the Furnaces control board, there should be a terminal labeled HUM on the control board. You need to bring 2 wires one from HUM and one from a nuetral tap on the board to the line side of the transformer, this way every time the blower motor on the Furnace turns on the humidifier will aswell.

need to go to furnace and watch it...if your hearing a hum the enducer draft motor may have failed...it should start first if there is no fault codes...reset unit by unplugging furnace or in some cases turning power switch off...turn thermostat on heat and watch unit ..the small enducer draft motor should start first the a ignitor glows and the should light...goodman units have a control board with a light on control board when it fails should flash a code and on the door or inside on lable should give you what that code is...hope this helps good luck

Did you check to see if you have power or fuse blown? If it is a furnace/ air handler and you are comfortable with electricity. Turn
Power off, remove blower door. Find where thermostat wires come into the control board and remove them. If you can find a jumper wire or aligator clips, hook them between R and G. Put blower
door back on and turn on power,

Fan should come on right away, if it does you might have a thermostat problem. If nothing happens but you can hear it hum
or hear nothing at all. Then more than likely the capacitor is bad and or the motor is bad.

if it is a fuel furnace the pump may have air in the system. here is a web site that will give you the information you will need to to help you fix the problem, there is a manual that will take you step by step to resove the problem, if you need more help understanding the troubleshooting of the system post to this e-mial you will get.
http://www.aircondition-units.com/pc-72-25-gms90703bxa-gas-furnace.aspx

when was last time furnace was serviced --air filter change burner area cleaned vacuumed the hum can be a few reasons ---fan bearing need service [ oiled ] fan bracket bushings damaged or loose --burner out of adjustment burning improper etc these are a few