This sounds typical of a faulty keypad. It sounds like you have a stuck key. The normal step to alleviate this is to replace the overlay and keypad. Replacement Parts for Fitness Exercise Equipment at SPORTSMITH
Stairmaster Stepper 4400PT Parts Chain Pedal Arm Fastener SPORTSMITH net
SOURCE: Stairmaster freeclimber 4400 pt will
Remove console knobs form the back of the console, lift the up, and disconnect the 20 pin cable from the console. Get a multi meter go to dc volts 100v range. On the connector you will be testing for 12 to 19 volts. When Looking at the connector the connector nipple should be pointing left starting form the bottom left odds numbers right bottom even you will hunt for pin 1 Neg pin 10 Pos. If all voltage readings are within 12 to 19 volts and the console is not powering up , then either replace or have the console repaired.
National Gym Parts can help with process go to http://www.gympart.com/
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