This is how I fixed my Life Fitness x5i console beeping problem.
LEGAL DISCLAIMER: DO THIS AT YOUR OWN RISK. THESE STEPS INCLUDE MODIFYING THE CONSOLE OF THE MACHINE AND WILL MOST LIKELY VOID ANY WARRANTY.
The problem with my machine was that one of the keys on the membrane keyboard on the console was damaged and making partial contact.
Inside the console there is a 7 pin connector and a ribbon cable that connects it to the membrane switch keypad. Only 6 pins are used. They are labeled key0, key1, key2, key3, com0 and com1.
The key map is as follows:
com1/key0=my workouts, com1/key1=level up main console, com1/key2=enter, com1/key3=clear/pause, com0/key0=quickstart, com0/key1=workout profile, com0/key2=level down main console, com0/key3=cool down
Step 1: Remove Console From Elliptical
On mine there were two screws securing the console to the machine. Remove these.
Once the console is loose, remove the ribbon cables going into the base of the machine.
Step 2: Make Replacement Keypad
To make a new keypad you will need the following:
4x Momentary Switches
1x SPDT Switch
1x PCB Perfboard
1x Jumper Wire Kit
1x Dupont Wire Female to Female Breadboard Jumper Wires Ribbon Cables
1x Soldering Iron
Step 3: Modify Console Shell
Using a dremel or similar device, make a hole at the seam of the console to pass the ribbon cable through.
Step 4: Connect Ribbon Cable to Console
Step 5: Reassemble and Attach Console
I used double sided tape to secure the new keypad to the console.