8. FREQUENTLY ASKED QUESTIONS
What should I do if...
...there is no heart rate reading (--)?
1.Check that the electrodes of the transmitter are moistened and that you are wearing it as instructed.
2.Check that you have kept the transmitter clean.
3.Check that there are no sources of electromagnetic radiation in close vicinity to the Polar wrist unit, such as TV sets, cell phones, CRT monitors, etc.
4.Cardiac arrhythmia may cause irregular readings or a cardiac event may have altered your ECG waveform. In these cases, consult your physician.
...heart symbol flashes irregularly?
1.Check that your wrist unit is inside the transmission range and not further than 3 feet/1 meter from the Polar transmitter you are wearing.
2.Check that the elastic strap has not become loose during exercise.
3.Make sure that the electrodes of the transmitter are moistened.
4.Make sure that there is no other heart rate transmitter within the reception range (3 feet/1 meter).
5.Cardiac arrhythmia may cause irregular readings. In this case, consult your physician.
...the heart rate reading becomes erratic or extremely high? Strong electromagnetic signals can cause erratic readings. So move away from possible sources of disturbance such as
If moving away does not help and the heart rate reading remains erratic, 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.
...the display is fading?
Usually the first sign of a discharged battery is the low battery
indicator 
or the fading of the digits when using the backlight (FS2c/FS3c). Have the batteries checked.
...the wrist unit battery needs changing?
We recommend that all services should be done by an authorized Polar Service Center. The
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