Dirty heart rate sensors, a wiring failure or a faulty console can prevent the elliptical from detecting or displaying your heart rate.
If the heart rate monitor contacts on the handgrips are dirty, clean the contacts using a rubbing alcohol and a soft cloth because dirty sensors won't detect your heart rate.
Check the wiring connections between the heart rate monitors and the console. Reconnect any loose wires and repair any broken wires. If the wires are okay, you may need to replace the console because it isn't detecting the heart rate monitors' signals.
These repairs may help solve your elliptical machine problem
Replace the elliptical console
The console displays the elapsed time, distance traveled, estimated calories burned, current speed and the user's pulse. If the console doesn't light up, replace the battery. If the problem continues, replace the console assembly. The console also controls the resistance motor. Replace the console if it fails to adjust the resistance motor.
If your elliptical console won't turn on or if the console display isn't working, the console might be broken. The DIY repair guide and video show how to replace an elliptical console in 3 quick steps.