SIGMA ONYX EASY - Manual (Page 52)

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7.4 TROUBLESHOOTING
Important note
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 Interference from electrical sources (high voltage lines,
railway cables, etc.).
k Transmitter battery (CR 2032) is dead (Item no. 00342).
Before starting to train, consult your doctor to avoid risks to
your health. This applies in particular if you have cardio-vascular
problems.
7.5 CHANGING THE BATTERY/WATERPROOFING
AND WARRANTY
Changing the battery
Battery CR 2032 (Item no. 00342) is used in
the heart rate monitor and chest belt.
ONYX EASY is equipped with a compartment
for changing the battery. Open the battery
compartment with the key provided, change
the battery and close the battery compartment
back up.