QuickCare: How to fix an ER2 error message on your thermometer

An ER2 error message relates to the ambient temperature being too low or too high before taking a temperature reading. This error message allows the thermometer to make sure it's always at the right starting temperature before giving out a reading. 

An ER2 message can happen to your Kinsa QuickCare thermometer if: 

  • The thermometer is held by the metal tip while being powered on.

This can slightly heat up the metal tip and throw off the thermometer. Instead, hold the thermometer from the rounded end when powering it on to avoid this error. 

  • The thermometer hasn't been given enough time to adjust to room temperature.

Thermometers are sensitive to temperature by design. If the thermometer was just in a different temperature, like after grabbing it from a car's dashboard on a sunny day, it may need a few minutes to adjust to the new temperature before it will work properly.


If this process didn’t get rid of the ER2 error, there's a small chance the battery inside is a dud (it's rare, but it happens) and needs to be replaced.

Your QuickCare takes one CR 2032 battery, available at all pharmacies, most grocery stores, and these online stores. We recommend Energizer or Panasonic brands.

But if you still get this Err error after replacing the battery with a new one, I'm sorry but it looks like we've exhausted all troubleshooting steps. If you bought your thermometer from a brick and mortar store like Target or CVS, please return the thermometer to the store for an exchange or refund. If the thermometer was purchased from Amazon, please follow the return or replacement process for Amazon purchases

If you bought your Kinsa thermometer directly from Kinsa's website we will be able to help. Please take photos of the front and back of your thermometer, showing its full length from tip to toe in each photo, like the ones below:

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If you are using the Kinsa app while taking a temperature be sure to send us a picture of the error message you saw in the app, this will help us to better understand the Err message you encountered!

Then use the pink button in the bottom right of this article to tell us about this error, and include your mailing address and these two photos with your message.