The low battery indicator is usually the first sign of an expired battery. However, in cold conditions the low
battery indicator may appear. The indicator will disappear as soon as you return to a normal temperature.
When the symbol appears, the running computer sounds and backlight are automatically deactivated. For
further information on changing the battery, see Care and Maintenance (page 47).
...I do not know where I am in the menu?
Press and hold STOP until the time of day is displayed.
...there are no reactions to any buttons?
Reset the running computer by pressing all the buttons simultaneously for two seconds until the display
fills with digits. Press any button and set the time and date in Basic Settings after the reset. All other
settings are saved. Skip the rest of the settings by pressing and holding STOP.
...the heart rate reading becomes erratic, extremely high or shows nil (00)?
• Make sure the running computer is no further than 1 m / 3 ft from the transmitter.
• Make sure the transmitter belt has not loosened during exercise.
• Make sure the textile electrodes in the sports apparel fit snugly.
• Make sure that the electrodes of the transmitter / sports apparel are moistened.
• Make sure the transmitter / sports apparel is clean.
• Make sure that there is no other heart rate transmitter within 1 m / 3 ft.
• Strong electromagnetic signals can cause erratic readings. For further information, see Precautions
(page 47).
• If the erratic heart rate reading continues despite moving away from the source of disturbance, slow down
your speed and check your pulse manually. If you feel it corresponds to the high reading on the display,
you may be experiencing cardiac arrhythmia. Most cases of arrhythmia are not serious, but consult your
doctor nevertheless.
• A cardiac event may have altered your ECG waveform. In this case, consult your physician.
…Memory full is displayed?
The message appears during exercise if you have recorded 99 laps or if no memory space is left for the
exercise. In that case, stop recording the exercise and transfer the exercise files from your running
computer to the Polar ProTrainer 5. Then delete them from the running computer.
…Check WearLink! is displayed and your running computer cannot find your heart rate signal?
• Make sure the running computer is no further than 1 m / 3 ft from the transmitter.
• Make sure the transmitter belt has not loosened during exercise.
• Make sure the textile electrodes in sports apparel fit snugly.
• Make sure that the electrodes of the transmitter / sports apparel are moistened.
• Make sure the transmitter / electrodes in the sports apparel are clean and undamaged.
• If the heart rate measurement does not work with the sports apparel, try using a WearLink strap. If your
heart rate is detected with the strap, the problem is most probably in the apparel. Please contact the
apparel retailer/manufacturer.
• If you have done all of the above-mentioned actions, and the message still appears and heart rate
measurement does not work, the battery of your transmitter may be empty. For further information, see
Care and Maintenance (page 47).
…Check Footpod! is displayed and speed and distance signals cannot be found?*
• Check that the foot pod function is activated in the running computer. If so, the runner symbol should be
displayed on the computer.
• Make sure that the foot pod is turned on by pressing and holding the red button on the foot pod.
• If the foot pod is on and you either see a red light or no light at all on the foot pod, the battery needs to be
replaced. For further information, see Install Foot Pod Battery (page 9).
• If you keep the running computer in front of you for longer than 15 seconds, the speed and distance
measurements stop. Reactivate the measurements by moving your hand.
• If you are running on a treadmill and have attached the running computer to a crossbar in front of you, try
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Customer Service Information 51
