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Heart Rate Intermittent


While rowing with a Garmin or Suunto chest belt, the heart rate disappears.



Try to determine whether the chest belt is still transmitting:

  • At a point when the heart rate disappears from the PM4, check the LED on the back of the monitor (near the network jacks; refer to photo). If the LED is blinking once per second, the chest belt is still transmitting and the PM4 is receiving; however, the chest belt may not be able to read the heart rate and so is not sending good data. This can be caused by any of the following:
    • Body/Chest Belt Not Warmed Up—Wet the chest belt contacts, and warm-up for at least five minutes.
    • Poor Chest Belt Positioning—If the display continues to be intermittent, the signal may be blocked by fatty tissue or poor positioning. Check the chest belt's positioning on your torso, and make any recommended adjustments (visit How to Use for more information).
    • Radio Frequency (RF) Interference—Transmission of the heart rate data may be affected by RF interference. Ensure that any local WiFi equipment is not transmitting on channels that overlap ANT transmission channels. WiFi (802.11b and 802.11g) can be safely configured on channels 1–6; channels 7–14 may start to interfere with ANT Wireless. Consult your access point user manual for information on how to change the WiFi transmission channel.
  • If the LED is not blinking, one of the following causes may be at play: