The most common reasons for this are poor contact with the chest strap and signal interference.
If you visit my tips and tricks page there is a step by step trouble shooting guide for heart rate monitors.
If you are not using a chest strap, but instead using the hand grips for HR, this is another issue.
Most common with hand grips is gripping too tight or your grip is somehow not making good contact with the handle. handle grips are not as accurate as chest straps as they are more reliant on "how" you grip the sensor. Also moving around your hands while gripping will cause problems.
finally - if all these things are satisfied, you may just have a weak sensor or problem with the maching itself.
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