It could be the flame sensor. It is located in the burner box Opposite from the ignitor. It is a metal rod with a porcelain base. The flame sensor "senses" a small electric current through the flame. If the sensor is dirty it can impede the electrical current and cause the control board to lock out. Remove the sensor and clean the rod with some steel wool or sandpaper. Reinstall and see if this solves the problem. Hope this helps.
Testimonial: "Thank you Bobalix. I clean the rod and reinstall but not solves problem. I used amp meter but did not see the amp change. do you think this rod it bad and need replace. Please advise"
SOURCE: Goodman Furnace m/n GKS90453BKAC
A constant red light (not blinking) indicates that the thermostat is not calling for heat. Of course you know it is but just to be safe, jump out R and W on the board. If it continues to do the same as you indicated, replace the board.
SOURCE: goodman gmp075-3 led blinks 5 times
I Also have the same and other problems with my furnace model # GDS80703AXBB. First the LED kept blinking 4 times and I too jumped the primary limit, that didn't kelp. After several attemps I moved the wires going to the circut board and everything starting working again. After a week It stopped working again, so I pulled the plug out of the circut board checked all wires for for a bad connection plugged it back in. Now the LED blinks 6 times again I move the wires. Then the LED blinks 3 times. Then the transformer burns out. I have burned out 2 transformers and I have ordered a new circut board.
SOURCE: furnace starts properly, then shuts down, led flashes 8 times
The first thing to look at is the flame sense rod.
Shut off power to the furnace, remove, clean sensor with steel wool or sandpaper then reinstall the sensor. Reapply power and it should run properly.
SOURCE: 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?
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