If it takes a long time to locate a signal or if the readings appear inconsistent:
- Check that your belt is correctly positioned on your body. Also check that it's the right way round.
- Check that you have dampened the sensors on your belt.
- The HR signal can be affected by electromagnetic interference (power lines, railway, computers etc. When using your heart rate monitor, ensure you stay away from similar kinds of interference
- Check that the battery is still charged.