Application Guide

ManualsBrandsPOLAR ManualsExercise & FitnessT31 Coded Chest Transmitter and Elastic Strap

Troubleshooting Heart Rate Signal Reception 
If your Polar training computer / sensor is not working as it should, try troubleshooting before 
contacting your closest Polar Service. 
1.  Are you wearing the heart rate sensor correctly?  
The heart rate sensor should be worn flat against the skin, Polar logo in upright position. 
See example here. 
 
 
2.  Are the heart rate sensor electrodes thoroughly wet? See example here. 
 
 
3.  Is the heart rate sensor and the elastic strap clean? 
Read more on Maintenance of heart rate sensor with textile strap or on T31 and T31C 
Transmitters. See also video instructions. 
 
 
4.  Is the heart rate sensor compatible with your training computer? 
 
 
5.  Is the training computer, that uses GymLink transmission, within 1 meter/ 3.3 feet 
range from the heart rate sensor? 
 
 
6.  If you have a Polar T31 transmitter, make sure that there are no other heart rate 
sensors with GymLink transmission, within 1 meter/ 3.3 feet radius. Check here what 
type of transmission your training computer uses. 
 
 
7.  Are the heart rate signals unusually high or otherwise abnormal? 
Relocating the training computer or adjusting the heart rate sensor on your body may 
help. For a list of possible sources of disturbance, see Abnormal Heart Rate Readings 
During Exercise. 
 
 
8.  Has the battery been changed by an unauthorized party? For some Polar training 
computer models you can change the battery yourself, for others Polar authorized service 
is recommended. See more here. 
 
 
9.  Does the ECG signal strength vary? 
ECG signal strength varies depending on the individual’s tissue composition. The 
percentage of people who experience difficulties measuring heart rate is higher in water 
environment than in normal use. 

Summary of content (2 pages)

PAGE 1
Troubleshooting Heart Rate Signal Reception If your Polar training computer / sensor is not working as it should, try troubleshooting before contacting your closest Polar Service. 1. Are you wearing the heart rate sensor correctly? The heart rate sensor should be worn flat against the skin, Polar logo in upright position. See example here. 2. Are the heart rate sensor electrodes thoroughly wet? See example here. 3.
PAGE 2
10. Were you using the training computer in, or near seawater or a swimming pool? Have the buttons been pressed under water? Seawater and swimming pool chemicals can affect ECG signal reception. Do not press buttons under water as it may cause leaking. For more on Polar products in water, see Polar Products in Water Environment. 11. Is the display frozen? If the display is frozen, try resetting the training device. See the user manual of the training device for instructions.