SIGMA PC 3 - Manual (Page 23)

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5. Trouble Shooting ( PC3 / PC7 )
No heart rate display:
• The inside surface of the conductive ribbed rubber pads are
not clean or not moist
• Sources of interference e.g. power lines
• Check battery of the transmitter
LCD display is sluggish or black:
• Possible at temperatures under 34°F or above 131°F
Display fades:
• Battery (Number CR 2025 or DL 2025) weak, change as
soon as possible
Watertightness:
The SIGMA SPORT heart rate monitors and transmitter unit are
water resistant to a 3m depth. The use in sea (salt water) should
be avoided and can cause malfunctions
6. Battery change ( PC3 / PC7 )
Battery in heart rate monitor CR 2025 or DL 2025. Battery in
transmitter belt CR 2032 or DL 2032 The SIGMA SPORT heart
rate monitor is a very sensitive and technical measuring instrument.
To guarantee the function and the water resistance, the battery
change has to be done only by an authorized dealer.
Its warranty is void if the watch has been tampered with,
taken apart or ill treated.