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filter may not be in correctly. if it is gas, check the pilot, if it doesn't have a pilot, it may be the ignitor. depending on how new your furnace is, it may have a safety feature that won't let it start for some reason. seeing that it will at least start the cycle is a good sign. it may be the filter not placed right. i'm not a furnace expert, just know my experiences. you may want to look at the limit switches as well, they only require a tester to see if they are good. if you own the testers, you probably know what you're looking for.
First find the electronic control board. Is the diagnostic light on and flashing a code? If not look for the automotive type fuse on the board. It is a 3 amp. Is it blown? Next look for a screw in fuse in the ssu switch on the side of the furnace. Is it blown? If all the fuses are good is the door switch behind the front cover working? Is the door properely installed? If all these items are working, you should have power to the furnace. If these items are ok, check for 24volts at the transformer. Check the terminals not black and white. If you have voltage there, remove the red and white thermostat wires on the control board. Next take jump wire and jump the red and white terminals. This rules out the stat and stat wiring. Your furnace should start. Check the status light for any further problems and crossreference the flashing light code to fix.
There is a window directly above the gas control valve. Either a spring held latch or a screw off cover need to be removed to access the pilot. To light the pilot, turn the knob to pilot and hold down while lighting pilot. The pilot in straight back inside the hole about 10 inches. Use a long fireplace match or rig a wire to hold the match. Once the pilot lights, hold the control knob down for about 30 secs., if it stays lit after release, turn to "On" and operate normally.
If the fan takes too long to come on, the high temp limit may be opening. Could be a defective limit, hard to say without more info. Another possibility is a mis-adjusted heat anticipator. A normal setting would be around .45 amp. The heat anticipator is inside the cover of the thermostat (older, analog style). Good luck.
if you know what the flame sensor is try gently cleaning it with sandpaper they get gummed up sometimes and don't sense the piolet flame, if they don;t see a piolet it will not allow it to kick the gas on