Goodman model gmt090-3b ignator is staying lit all the time cause them to burn out .have changed board same problem.

bad flame sensor or control board

Most generally the original circuit board has a model number on it that should be the same as a replacement board. If it does not match, then you may have the wrong replacement. Why did the board burn up? It may have caused a short that you have not diagnosed, thus possibly shorting out the new board. The fan stays running because the call for cooling is not satisfied.

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I cleaned the sensor that was at the the right further most burner on my Goodman and it worked. got the answer to my problem here at fixya. My burner flame only lasted 5 secs before it shut off. Thanks to all who took the time to send me a response.

Hello Flame rod should have done the trick.Make sure the rod & the control are GROUNDED (earth).Make sure the rod is not touching anything & in the gas flame.

possible faulty gas valve if all fail safes stay closed. make sure flue is clear for pressure switch to stay closed.

check that pilot flame is in contact with the thermocouple the small copper cylinder if not properly burning against adjust if flame is good and the therm/coupl is not covered in soot(wipe clean if has build up)thermocouple gone bad replace

A bit more info is needed. What model #, and how old is it? In back, does it have a computer board (underneath a green or black plastic cover, appros 4" x 6")? Im guessing that it does, ('cause you get an error message,) Make sure that you have a good 12 volts going to the board at all times, and make sure that the glass fuses on the board are not blown. If that checks out, than its a real good bet the you have a defective board. For Americana models, you're going to need a Dometic board, and for other models, an aftermarket board will usually do. Althoiugh the OEM ones have a better chance of fixing your problem.

sounds like you have a bad control board or limit control

Sounds like a thermocouple, or flame sensor.
Are you skilled on working on appliances of this sort?
I am a goodman dealer and will need your model number.

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.