- Heart rate does not show up: Make
sure that you have good contacts between the electrodes and your
skin. Remoisten the electrodes. Make sure your chest belt
fits securely and properly positioned at the center of the
chest. Or, the transmitter battery may be worn-out.
Replace the battery. Make sure the battery is installed
correctly with the (+) side facing up.
- Display is blank or very dim: The
watch battery power may be low, try a new battery. Make sure the
battery is installed correctly.
- Display becomes dark or black:
The watch is too hot. Place the unit in a shaded area, and it
should turn normal after a while.
- The unit operates slowly or
sluggishly: The unit is too cold. Warm the unit, and it
should turn normal.
- Heart rate varies widely: Make
sure your chest belt fits securely and is properly positioned at the
center of the chest (refer to the Transmitter & Elastic Strap
section in the manual). Check your surroundings for electromagnetic
or high energy interference and move away from the source of
If all fails, please contact Sensor
Dynamics at 1-800-764-4327 or email us at email@example.com