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interference or brief jamming of the signal. If this occurs, the watch
suspends the flashing of the heart. Usually the problem resolves itself
and the flashing resumes. If the interruption continues, the watch
alerts you with the error message described below.
The message “NO HRM DATA” appears on the display.
This error message is displayed if the watch is not receiving regular heart
rate updates from the sensor. However, as long as the sensor is on the
chest, its pads are wet, and the battery in the transmitter is not weak, the
watch will usually recover without intervention on your part. If it does not
recover, try the following:
• The sensor pads on the chest transmitter may have lost contact with
your chest for a few seconds. Be sure the transmitter is snug on
your body.
• The sensor pads may be dry. Liberally moisten them and readjust the
chest transmitter if necessary.
• The battery in the chest transmitter may be weak and need replacing.
(See instructions in the Fitness Sensor User Guide for battery
replacement.)
Troubleshooting HRM-related Problems
Troubleshooting advice for common problems:
I’m having trouble getting a first reading, OR the heart rate numbers
appear to be incorrect during operation.
• Liberally reapply moisture to the textured contact pads on the back of
the heart rate sensor.
• Tighten the chest strap until it fits snugly and makes good contact
with the skin. Make sure the sensor is secure against your skin and is
placed with TIMEX facing up.
• Move away from other heart rate sensors and other sources of radio
signals and static electricity such as exercise equipment and other
electrical machinery.
• Wait a couple of minutes and press HEART RATE again.
Sometimes I see dashes on the display bracketing my heart rate, OR the
heart rate displayed remains unchanged for an extended period of time.
What does this mean?
• This usually indicates that either the sensor pads need moisture or the
chest unit is not snug on your chest, causing poor electrical contact
with your skin. Moisten the sensor pads and adjust the transmitter so
that both pads are making good contact with your chest.
Sometimes the heart stops flashing briefly.
• As long as the heart is flashing, the watch is receiving a clear signal
from the monitor. As with any radio system, there may be occasional
