Troubleshoot & FAQ (BT502)

Changing from C to F

  1. Press the trigger to power the thermometer on.
  2. Once "Lo" is displayed, press and hold the "Setting" button until "F1" appears, then release the button.
  3. While "F1" is displayed, use the "+" or "-" buttons to change from °F (Fahrenheit) or °C (Celsius).
  4. Press the "Setting" button four times until the thermometer powers off to save your settings.



Thermometer does not power on after pressing the measurement/trigger button

  • The batteries are most likely out of power. Please replace with a new set of AA alkaline batteries.
  • After installing new batteries, double check to see if they are installed into the correct position.



Temperature reading is low

  • During the temperature measurement, you must remain still.
  • Keep away from any airflow that may disrupt the measurement.
  • Take measurements 1-2 inches away from the center of the forehead.



"HI" code indication

  • Temperature is greater than 109.2 °F (42.9 °C) on body mode.
  • Temperature is greater than 176 °F (80 °C) on object mode, or environmental temperature is beyond the maximum range.



"Lo" code indication

  • Temperature is less than 89.6 °F (32.0 °C) on body mode.
  • Temperature is less than 32.0 °F (0 °C) on object mode, or environmental temperature is beyond the minimum range.



"Err" is appearing on the LCD

  • Data error; please contact support at (800) 467-6408.


Battery icon is flashing

  • Indicates low battery power. Please replace with new alkaline batteries.



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