Suunto t3 User Manual page 19

After switching to Training mode,
Suunto t3 displays two bars while it is
seeking the HR belt signal.
Once the device has found the signals, your heart rate or speed and distance information will be
displayed in the center of the screen.
NOTE
Heart rate signal troubleshooting
If you can't see a heart rate signal, or lose the signal, try these steps to fix the problem.
•
Exit and then re-enter Training mode.
•
Make sure that you are wearing the heart rate transmitter belt correctly. (See section 2.1.1.)
•
Ensure that the electrode area on the back of the belt is slightly wet.
•
If you have been using the belt for some time, the battery may need changing. For instructions
on how to change the transmitter belt's battery, see section 5.
For detailed instructions on how to pair and calibrate your optional speed
and distance POD, please refer to the POD's own user's guide.
Instead of your heart rate, "00" is
shown in the center of the display if no
heart rate belt is found.
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