9. FREQUENTLY ASKED QUESTIONS
What should I do if...
…I don’t know where I am in the menu?
Press and hold the OK button until the time of day is displayed.
…there is no heart rate reading (00)?
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, cellular phones, CRT monitors etc.
4.Have you had a cardiac event that may have altered your ECG waveform? In this case, consult your physician.
…heart symbol 
flashes irregularly?
1.Check that your wrist unit is inside the transmission range and not further that 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.
…heart rate reading becomes erratic or extremely high?
You may have come within range of strong electromagnetic signals, which can cause erratic readings on the wrist unit display. Check your surroundings and move further away from the source of the disturbance.
…the display is blank?
The Polar F4 heart rate monitor is in battery saving mode when it is dispatched from the factory. To activate it, press any of the buttons. The Basic Settings starts. See the section, Basic Settings on page 37.
…the display is fading?
The first sign of an expired battery is the low battery 
symbol. Have the batteries checked. After battery replacement, you only need to set the time of day and date in the Basic Settings. After setting these values you can get to the Time of Day display by pressing and holding the OK button.
…the buttons do not react?
Reset the wrist unit by pressing and holding both buttons. The display is filled with digits. By pressing any button the unit goes to the Basic Settings mode (SETTINGS is displayed). When you have completed the Basic Settings, the unit returns automatically to the Time of Day display. If this does not work, have the batteries checked.
…the wrist unit battery needs changing?
We recommend that all service should be done by an authorized Polar Service Center. The
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