My central air fan isn't blowing. The thermostat

It should not. The burner heats a manifold and air is drawn thru the hot manifold to warm the air. As long as the manifold Is in good shape, no co2 will contaminate the warmed air. However, if the fan does not blow air over the manifold, the the thermal fuse will be blown and stop the heater from working at all. Fan noise is not good. Get professional help asap

check power to outside unit, check if it has a fused disconnect, if you have power and no blown fuses it could be a blown capicator that starts the fan and compressor...............

Then you must have a low voltage problem. Do you have 110/220v going to transformer and do you have
24 volts coming out. If the answer is yes, try to turn
indoor fan to the on position if it comes on, then it
sounds like you have a connection problem with thermostat or control board.

If fan wont come on, their could be a little fuse located in the circuit board on indoor unit and it could
have blown. If thats the case and it blows when you replace the fuse again. Disconnect the thermostat wires, put new fuse in. If it does not blow then you have a short in your thermostat wires

Could have blown a fuse or the thermostat may need to be reset .

If you have had a drop in how much air is coming out it is quite likely not fan related. The fan motors usually run or do not run. More likely it is a clogged air filter or some of your ducting has blown loose. Like water, air will go the route of least resistance. If your fan motor is not running at all, I would need model number for resolving that.

If nothing is happening could be thermostat control wires cut? try using a jumper wire @ the furnace their will be a board with the letters R G W Y B try to jumper R to G the fan should come on. if not its in the controls of the furnace if fan comes on replace the thermostat. don't short the wires you will blow that small fuse. T

Q - My microwave went dead when I opened the door ( same problem as closed the door ).
A - This often is a stuck or faulty door switch and it has blown the interior microwave fuse.
Q - My microwave is completely dead.
A - House fuse has blown or interior fuse inside the microwave has blown ( usually a part inside the microwave makes this fuse blow ) Sometimes a bad fuse holder inside the microwave cannot hold the fuse tight enough and the fuse will blow as well. 
Q - My microwave blows the fuse inside itself as soon as I push the start button.
A - Usually a shorted high voltage capacitor...see components section.
Q - I burnt something in my microwave and now it is dead...help!
A - The fuse inside the microwave may have blown, but more commonly the flame/oven thermostat has sensed the over cooked food and the flame/oven/cavity thermostat has opened up - Info on that 
Q - My microwave seems to shut off every once in a while, what might be wrong?
A - Make sure you hear the fan is still operating in your microwave. Next is to make sure the air intake grill on your microwave is not plugged up with air borne dust and dirt.
Q - The microwave makes a loud "hum or buzz" noise but will not heat up the food?
A - 9 times out of 10 this is usually this is a bad magnetron, the other time is sometimes a bad high voltage diode. See components section.

3 amp is standard.the fuse is blowing to protect the transformer.It is telling you that there is a short in the low voltage wiring.Goodman also had an issue with the coil shorting on the contactor.To prevent damage.....i'd call a pro.It should be a fairly simple repair.

Sounds like it may have lost power. Check the breaker and the fuse at the furnace. If they are all in the on position and working then it sounds like you may need a technician. If the display is blank on the thermostat you may also want to replace the batteries.