Will not fire led light flashing 2 times

blower fan relay for older unit or board for newer unit

Since the burners light this eliminates the pressure switch as the problem. Typically when the burners come on and shut off quickly a flame sensor, ground problem or the limit switch tripping are the main reasons. Since the flame sensor has been replaced, check the limit switch

does the unit actually fire just not stay lite... if so then the flame sensor is the culprit..sometimes you can pull it out and lightly sand it don't go crazy because to much sanding can really cause problems... if the unit does not light then what is the sequence it goes through before failing... this unit have a hot surface ignitor i am assumming (glow plug some call it) or is it spark ignition with a module box on it... either way the sequence of operation should be a call from the thermostat made for heat, the enducer draft motor comes on (small motor with a wheel on it) then the enducer draft motor pulls a negative pressure on the pressure switch (round switch with hose attached to it) make sure hose is not kinked or broken,also pull off and check for debri in hose and in holes where it connects to... after pressure switch closes it will send power to ignitor /or spark module once glowing the gas valve should open and allow gas to enter burner orfices and fire ... once unit has lighted then the flame sensor continues to measure milivolt and send bacl to board to keep gas valve open while call for heat... if the flame sensor is dirty or faulty it will not allow the gas valve to stay open. repost with more info ///watch unit where does it fail... most goodman units have a code schematic on the door of unit or inside... should tell you what the number of flashes means if it still is there let it fail and count the number of flashes and then see what code is for that failure.... good luck to you

4 flashes is an overheat situation most likely caused by the blower not blowing. The blower relay controls the blower function. It is part of the circuit board. I suspect a new board will take care of the problem if you don't find a lose wire or something simple.

I would check to see if the switch on the blower pressure sensor is closing...When T-stat calls for flame, the circuit starts the blower, then the blower pressure sensor switch closes to allow the main gas valve to be powered.

I am guessing that their is a flag control(switch) in the airstream of the vent and it is now stuck in the closed position due to the snow, maybe. Find the flag switch and make sure it can move freely. It must move freely for the venter fan airstream to operate or move it.  

I was told all lights flashing means the pot is flooded. Unplug your heater. Take take the cover off. Unscrew the igniter and pull it out. Roll up a piece of paper towel, put it in there and see if it absorbs any fuel.

You could also be in need of a cleaning. If your burner pot is full of carbon, a chain of it will attach itself to the flame sensor rod, thus putting out the fire. Also if your burner ring in the burner pot is too warped this will put the flame out.

;)

Not sure exactly what is meant by half way it shuts off. My furnance wouldn't heat to 68 degrees from a setting of 63 degrees on the setback thermostat without shutting down several times with a single flashing led. It would reset after an hour or so until it finally reached the 68 degrees. The problem turned out to be the tube that drains the water from the blower assembly. It had a belly in the middle which would cause the water to sit and block the airflow sensor for the gas value. Lifted tube to allow proper drainage to correct.