We have the Braun 6022 thermometer. It is reading in C so temps are coming up (ex. 37.1 C) how do we get it back to F

If your Braun Thermoscan 6022 thermometer is not switching on even after you have replaced the batteries, there could be a few possible causes:

1. Battery installation: Make sure that you have inserted the batteries correctly, with the correct polarity. Check the battery contacts for any corrosion or debris and clean them if necessary.
2. Battery type: The Braun Thermoscan 6022 requires two AA alkaline batteries. If you have used a different type of battery, such as rechargeable batteries, this could be the reason why the thermometer is not turning on.
3. Battery life: Even if the batteries are new, they could be defective or may have run out of charge quickly. Try replacing the batteries with a fresh set of AA alkaline batteries.
4. Reset: Try resetting the thermometer by removing the batteries for at least one minute and then reinserting them. This can sometimes help to reset the internal electronics of the thermometer.
5. Faulty thermometer: If none of the above steps work, it is possible that the thermometer itself is faulty. In this case, you may need to contact Braun customer support for further assistance or consider purchasing a new thermometer.

https://www.youtube.com/watch?v=sf1wz4-Cpnc&t=215s

Watch this video to reset the device.

It's probable that it needs a new lens filter or the filter needs cleaning. I have no idea how to remove the filter but it probably clips or screws off the bit that goes in the ear.
Quite frankly the device is at best unreliable, it measures infra-red in the ear, great in theory but not very reliable in practice. I would use a different thermometer.

IF this is from something sticky on it or just plain wear, the best thing to use is armour all. It is a silcon based protectant that is slippery.

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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.

It's not po5, its pos... you're not positioning it properly in the ear canal.