SIGMA ONYX PRO - Manual (Page 100)

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IMPORTANT INFORMATION
If no heart rate is shown on the display, this may be due to
the following reasons:
k The belt with the heart rate transmitter is not worn correctly.
k The sensors (electrodes) on the heart rate transmitter are
dirty or dry.
k Transmitter battery (CR 2032) is empty (Item no. 00342).
Before starting to train consult your doctor to avoid risks to
your health. This applies in particular if you have cardiovascular
problems.
Changing the battery
Battery CR 2032 (item no. 00342) is used in
the heart rate monitor and chest belt.
Chestbelt:
k Open the top cover with a coin
k Pay attention to the polarity!
Heart rate monitor:
k Open top cover with tool.
k Pay attention to polarity!
7.7 CHANGING THE BATTERY AND WARRANTY