Have a braun thermoscan and it keeps saying lo???

Question edited for clarity, and spelling 'brain' to Braun, and 'thermoter' to thermometer, 'comes in' to comes on..
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There are some ideas here, but it sounds faulty and needs warranty return or repair.

https://www.google.com/search?q=Braun+thermoscan+hm3+not+working

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The user manual used to be online, but apparently is no longer there, but the web site has answers to some questions.

http://personalcare.manualsonline.com/support/braun/thermometer/thermoscan-350168

http://personalcare.manualsonline.com/support/braun/thermometer/thermoscan-350168

Yes

Have you tried replacing the disposable-lens filter ?
The manual is available at: http://brauntherms.com/downloads/IRT4020_4520_MNLA_U.0035_OM_25JAN11.pdf

this is manual for 6022.. Braun Shaver Owner Manual ManualsOnline com

Turn off the thermometer
Press and Hold the L/O Button
Continue to hold the start button when the F or C display appears. Watch for these displays to cycle over the display window.
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Release the start button when the F display appears on the screen.
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5

Listen for a beep and watch for the Braun ThermoScan ear thermometer to shut itself off, indicating that you changed the temperature scale to Fahrenheit successfully.
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6

Follow the same procedure but release the start button when C shows on the display to switch from Fahrenheit to Celsius.

Problem:
Temperature taken is not within typical human temperature range (93.2 °F - 108 °F / 34 °C - 42.2 °C).

Solution:
Make sure new, clean lens filter is properly inserted. Then, take a new temperature.

... call Braun ThermoScan customer service at 1-800-327-7226