Troubleshooting: Thermapen ONE

Here are answers to some common technical support questions about the Thermapen ONE.

How do I install the Silicone Boot?

How do I change my Thermapen ONE’s battery?

How do I use my Thermapen ONE?

I accidentally broke my Thermapen ONE’s battery cover. How do I get a replacement?

We are happy to send you a new battery cover at no charge. Please contact our Tech Support, and we’ll send you one right away. Their contact information is found below.

Where can I get instructions for the Thermapen ONE?

Download Thermapen ONE Operating Instructions

Download Thermapen ONE Calibration Trim Instructions

Download Thermapen ONE Product Info Sheet

How do I test my Thermapen for accuracy?

An ice bath test is the best way to verify the accuracy of your Thermapen ONE, because it’s a standard laboratory test that is easily replicated at home. Directions for making a proper ice bath are found here.

If your Thermapen is accurate, it will read within ± 0.5°F of 32°F (31.5 to 32.5°F). If it is reading accurately in this test, you can rest assured that it is reading accurately in food and at higher temperatures.

My Thermapen ONE recently stopped working without warning. I’ve replaced the batteries, but it didn’t help. Can you help?

While it is extremely rare that a Thermapen suddenly stops working, we are sorry that it has happened to you. Our Tech Support team needs to take a look at your Thermapen to determine what has gone wrong. If we discover that the issue is covered by warranty, we’ll either repair or replace it without charge (depending on the source of the issue.)

If we discover that the issue is related to a problem not covered by the warranty, we offer affordable repair services for $40, which includes return shipping.

Please contact our Tech Support team and they will set up a Return Authorization for you.

My Thermapen doesn’t turn on until the probe is in the fully open position. Is this something you can fix? How much will it cost?

In most cases when we see this error, it is because foreign matter has worked its way into the rotating hub. While there is an O-ring seal inside, oils, moisture, flour, or fine powders can work their way past the seal over time and accumulate in the housing, interfering with electrical components. This particular issue is one that we need to repair for you. If we discover that the issue is covered by warranty, we’ll either repair or replace it without charge (depending on the source of the issue.)

If we discover that the issue is related to a problem not covered by the warranty, we offer affordable repair services for $40, which includes return shipping.

Please contact our Tech Support team and they will set up a Return Authorization for you.

What does it mean that my Thermapen is displaying a “C.Lo” error?

The C.Lo message means that the Thermapen is trying to go into calibration mode. When the Thermapen does it on its own, it usually means that there is something wrong inside the Thermapen. We recommend that we take a look at it.

If we discover that the issue is covered by warranty, we’ll either repair or replace it without charge (depending on the source of the issue.)

If we discover that the issue is related to a problem not covered by the warranty, we offer affordable repair services for $40, which includes return shipping.

Please contact our Tech Support team so they can help you. The information you need is found below.

I am seeing some inconsistencies with the backlight. At times, I can get it to come on by covering the sensors, but not always. Is there some sort of setting to configure it?

The Thermapen ONE’s intelligent backlight turns on if it is exposed to enough ambient light. If there is too much ambient light, it won’t turn on and it may appear that the backlight isn’t working.

If you need to activate the backlight, cover the light sensor (the dot) located on the right-side of the display window with your thumb. If that doesn’t work, cover the sensor and part of the display with your palm. Once triggered, the backlight will stay on for 10 seconds.

If your Thermapen’s backlight isn’t working as expected, please contact our Tech Support team. They’ll be happy to help you.

My Thermapen ONE’s screen has been getting cloudy. Is there anything I can do?

By chance, has the display been cleaned with isopropyl alcohol?

We have found this to cause the screen to appear cloudy, when in fact, it is more consistent with etching of the display.

We do offer affordable repair services for the Thermapen for $40 and would be happy to send you a Return Authorization for repair. Our Tech Support team can help you with that.