Four flashes on Goodman GDS80904BX circuit board

I have this clunker-4 flashes is an open high limit code according to the wiring diagram and fault code sheet. the common denomonator for this furnaces problems is the circuit board. Always flashing 3, 4, 7 times most of the time having nothing to do with the problem. The actual problem is the board it's self. take it off the mounts (POWER OFF FIRST AND SWITCH OFF>)
remove from the 4 mounts one at a time then check the back of the board. you will probably notice brown spots on the green. this is where the board has burned up. replace the board and you will be fine, you will also be the 100th person I know to have this problem. Make sure you take a picture of the board before you take all the wires off so you can put them back properly. I personally have replaced the board twice the first replacement I purchased (warranty) was made by the same company as the original, the second board I replaced 1 year later with a new board made by a new manufacturer. they obviously knew there was a problem.

http://hphotos-snc3.fbcdn.net/hs066.snc3/13331_1198507328519_1403584043_30566732_3667503_n.jpg

this is a picture of a board another fixya user sent me today after he had the same problem as you and I told him what to look for. look familliar?

Look on the wiring diagram for a diagnostic code chart. It will indicate where to start looking for the problem. Here is a basic sequence of operation for your furnace, it may help.
On a call for heat, the 24 volt thermostat sends a signal to the control module. The control module will indicate a call for heat with a light on the control either blinking or remain solid depending upon model. The inducer (exhaust) blower will purge all gasses from the furnace and pressurize a pressure switch. Once the pressure switch tells the module to continue, the electronic ignition will energize and send 120 volts to the igniter. The igniter will glow and you will be able to see it if viewed thru the small inspection port. Once the igniter gets hot enough, it sends a signal to the module opening up the gas valve (24 volts). Either a pilot will come on or the burner tube will ignite then spread the flame to all burners. Lastly a safety sensor will be looking for a certain temperature within a few seconds and the furnace will continue to operate and the room air blower will turn on in a minute or two.

What could go wrong? The unit will not run if there is no signal from the thermostat (bad thermostat or broken wire), the control module does not sense a signal from the thermostat (bad control), the inducer does not energize (bad motor), the pressure switch does not close (blocked vent piping, bad switch, plugged condensate hose), the igniter does not energize (bad control, bad igniter), the gas valve does not open or there is no gas (bad gas valve, broken wire, no gas), the pilot does not light (dirty pilot), the burner does not light (bad burner, plugged orifice, not enough combustion air), the flame does not spread to each burner (bad flame spreader, dirty flame spreader, more bad burners), the flame safety sensor does not detect flame (dirty or bad flame spreader, bad flame sensor, broken wire, bad control), or the room air blower does not energize (bad fan motor, bad control).