Stairmaster 4000 PT series, Owner'S Manual

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“BOTH HR OFF“ - turns off the ability to detect any signal at
all. Used in rare situations where there is excessive interference
with the heart rate signals. This option turns off disables the
Constant HR program and the Fitness Test program.
Error Messages
Text line messages are only seen in the Constant Heart Rate and Fitness Test
programs due to the design of the program that necessitates a valid heart rate
signal at all times during the program.
“ CHECK HR BELT ” - The heart rate signal has been missing for
the last 30 seconds in telemetry signal detection.
“HR BELT NEEDED” - No telemetry belt signal been sensed
during the initial setup time.
“
HR MODE DISABLED ” - No heart rate signal is allowed due to
the set up option that was chosen. Heart rate monitoring is not
possible.
HEART RATE MONITORING