This means that the sensor is not plugged in or has been damaged. This Thermometer is a resistive device. If the thermistor is not connected the resistance is too high and thus out of range. The unit will then display the 'HHH'.
HHH - Amazon.com: Customer Questions & Answers
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Why is my thermometer is displaying letters (LLL/HHH ...
maverickhousewares.zendesk.com > en-us > articles > 3...
May 31, 2019 - ErrH - This is a code that will sometimes display on digital instant read thermometers. It indicates than an internal error has occurred and it will no longer read temperatures. This can be a result of drop/fall damage, water immersion/moisture buildup, or exposure to direct heat/flame.
Troubleshooting: ThermoPop ' ThermoWorks Help Center
help.thermoworks.com > ... > ThermoPop Help
Oct 19, 2017 - My ThermoPop is displaying an LLL or HHH error. What does it mean? There are several reasons your ThermoPop may display either an LLL or ...
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