...heart rate reading becomes erratic or extremely high?
You may have come within range of strong electromagnetic signals which cause erratic readings. Check your surroundings and move further away from the source of disturbance.
...the display is blank or fading?
If the display is blank, activate the wrist receiver by pressing the OK button twice, after which the Time of Day display appears. If the display is fading, have the batteries checked.
...there are no reactions to any buttons?
Reset the Polar heart rate monitor. Resetting clears watch settings which will return to the default settings.
1.Press the RESET button with a pen tip. Display becomes full of digits. If you don’t press any button after reset within one minute the wrist receiver returns to the Time of Day display.
2.Press any of the buttons once. Time of day is displayed.
...the battery of the wrist receiver must be replaced?
We recommend having all service done by an authorized Polar Service Center. This is especially necessary to ensure the warranty remains valid and is not affected by incorrect repair procedures done by an unauthorized agent. Polar Service will test your wrist receiver for water resistance after battery replacement and make a full periodic check of the complete Polar heart rate monitor.
...the speed reading is 00 or there is no speed reading on the display while cycling?
1.Check the correct position and distance of the speed sensor with the spoke magnet.
2.Check that you have set bike functions on.
...the S150 wrist receiver displays speed and distance readings when I am using it in my wrist?
Turn the speed measurement off. This prevents the receiver from recording incorrect speed signals which may occur due to moisture in your skin.
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