Indusor motor comes on, then ignitor glows, flames up and then goes out in few seconds. Does this three times, and locks out with ignition failure as code. Replaced flame sensor already. It is one that has centrifical switch instead of pressure switch # DGAT 056 BDD

Are you sure the flame is hitting the sensor rod?
Make sure you have a good ground.
To check the flame sensor you will need a micro ampmeter.