POLAR S725 - Manual (Page 100)

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3. Check that you are not near other people that have heart rate monitors,
high voltage power lines, televisions, mobile phones or other sources of
electromagnetic disturbance.
4. Have you had a cardiac event which may have altered your ECG
waveform? In this case consult your physician.
...heart symbol flashes irregularly?
1. Check that the wrist unit is not further than 1 meter/ 3 feet from the
transmitter.
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
1 meter/ 3 feet.
5. Cardiac arrhythmia may cause irregular readings. In this case consult
your physician.
...other person with heart rate monitor is causing interference?
Your training partner may have exactly the same code as you. In this case
proceed as follows: Keep a distance from your training partner and
continue your training session normally.
Or
1. Take the transmitter off your chest for 30 seconds. Keep a distance from
your training partner.
2. Put the transmitter back and bring the wrist unit up to your chest near
the transmitter’s Polar logo. The wrist unit starts looking for a heart rate
signal again. Continue your training session normally.
...heart rate reading becomes erratic or extremely high?
You may have come within range of strong electromagnetic signals which