If pedal resistance sticks on one setting, the resistance motor could be defective. Many elliptical exercisers offer workout programs that vary resistance automatically during the routine. If resistance during the uphill climbs on a pre-programmed workout feels the same as the downhill treks, try manually changing the resistance. If you can change resistance manually, then you'll need to replace the console.
If manually changing elliptical resistance is not working, then check the current going from the console to the resistance motor. Most elliptical exercisers use battery power to change resistance, so checking for DC voltage going to the resistance motor is safe and easy. If batteries power your elliptical's control system, use a multimeter to measure voltage at the resistance motor when you manually adjust resistance on the console. Replace the console if it doesn't send voltage to the resistance motor when you manually change resistance. Replace the resistance motor if it doesn't run when getting voltage from the console.
If your elliptical exerciser plugs into an electrical wall outlet, unplug the elliptical and check wire harness connections between the console and the resistance motor. Use a multimeter to check continuity through wiring and the resistance motor. Repair or replace any damaged wiring. Replace the resistance motor if your meter measures infinite resistance through the motor. If the wiring and resistance motor are both okay, then you'll likely need to replace the console.
These troubleshooting tips can help you resolve Icon, Weslo, ProForm, Lifestyler and Life Fitness elliptical resistance problems.