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Your furnace has a fuse inside on the circuit board. Make sure that is good. Also the circuit has a door switch that breaks power, so when you open the door find the switch press it in then use a muti-meter on the C and W,G, Y terminals to see if you have 24 volts. IF your unit is getting power from the transformer then the break or open circuit is possibly a safety or some other issue and I would then recommend calling in a local professional.
humming could be a body panel or metal to metal point that came loose and just needs secured in the furnace or ductwork. could be an electrical issue that you may or may not be able to find with the doors off and trying to locate where the hum is coming from. it may go away when a panel is removed because it night be air sucking through a loose section of the door. the question is vague but I would press around while its running to see if it subsides. as always when its running with the panels off electric shock hazard and arc flash can occur causing bodily injury or death that's why they have the door switch which will cause the unit not to work with the door off. you can tape this switch to test the furnace but be very aware it is done on your own and I cant tell you it is ok to do this if you have no knowledge of electricity and its dangers. this is only for you to possibly find a hum and not press around on electrical components.
Hello my name is Heath it will be my pleasure to assist you. First thing to do is go to the furnace take off the lower blower door and locate the circuit board turn the power off to the furnace. In the circuit board there should ba a small car like fuse usually 3 or 5 amps check the fuse it is probably blown replace the fuse with the same amperage fuse and then turn the power back on on the furnace and check the operation of the furnace.
The model number for Ruud/Rheem equipment is located in the 12-13 digits, these appears to be a 1994. I have seen some furnaces with an age older than when the home was built (a 1995 furnace in a home built in 2000), so good job checking the serial number. This gives you the age it was manufactured.
Hope this helps
Make sure that the air filter is clean and there are no restrictions in the duct system ie. carpet over register, dog lays on vent etc... If that looks OK, check your thermostat to see if it is still calling (sending a signal) to the furnace by inspecting the circuit board. I think this model of furnace will blink rapidly if there is a call for heat. You can confirm what your furnace does by looking at the board when there is a starting of a heat cycle. Keep in mind that you will need to look thru the small viewing window and not remove the door panel that has the door safety switch. The door switch de=energizes the system. The board will also blink a certain number of times if it experiences an error. You can find the diagnostic chart on the wiring diagram pasted on one of the door panels. It may give you a starting point where to look if you have an error code blinking.
I would try to check your return air first, making sure there is no blockage and that your air filters are clean. It almost sounds like when you take the cover off, you are pulling enough air into the system for it to run, but as soon as you close it off, it's not getting enough air flow, therefore, tripping a limit switch inside the furnace. Most furnaces will also have the codes for the flashing lights and what they mean on the inside of the door covers.
sounds like the unit goes in lockout mode which shutting off the power and putting it back on will reset the computer now the next time it happens dont shut off the power and in the blower compartment on the board there will be a blinking light count how many times and on the door it will explain do not remove the door until you have counted the beeps throgh the little hole
The door, you mean the metal cover on the front? if you have the door off and push the safety switch in with your hand everything works fine? I need more info here, but if what I said is right, then the "door" isn't making good contact with the switch.